diff --git a/README.md b/README.md
index 0dca42ad..ebf0815c 100644
--- a/README.md
+++ b/README.md
@@ -234,6 +234,7 @@ These checks are available in the package. You can add or remove checks in the c
 ✅ The page contains no broken links. <br>
 ✅ The page contains no broken images. <br>
 ✅ Length of the content is at least 2100 characters. <br>
+✅ No more than 20% of the content contains too long sentences (more than 20 words). <br>
 
 ### Meta
 
diff --git a/resources/lang/en.json b/resources/lang/en.json
index b4255720..cf7c144b 100644
--- a/resources/lang/en.json
+++ b/resources/lang/en.json
@@ -29,5 +29,6 @@
     "failed.performance.javascript_size": "The page contains Javascript files that are too large (max :expectedValue). These files were found: :actualValue.",
     "failed.performance.response": "The page returned a response code other than :expectedValue. The actual response code was :actualValue.",
     "failed.performance.ttfb": "The page took too long to load (max :expectedValuems). The actual time was :actualValuems.",
-    "failed.performance.ttfb.missing_url": "We could not get the TTFB for this page."
+    "failed.performance.ttfb.missing_url": "We could not get the TTFB for this page.",
+    "failed.content.too_long_sentence": "The page contains :actualValue sentences that are too long."
 }
\ No newline at end of file
diff --git a/resources/lang/nl.json b/resources/lang/nl.json
index 8cc4583c..8b1fcd39 100644
--- a/resources/lang/nl.json
+++ b/resources/lang/nl.json
@@ -27,5 +27,6 @@
     "failed.performance.javascript_size": "The page contains Javascript files that are too large (max :expectedValue). These files were found: :actualValue.",
     "failed.performance.response": "The page returned a response code other than :expectedValue. The actual response code was :actualValue.",
     "failed.performance.ttfb": "The page took too long to load (max :expectedValuems). The actual time was :actualValuems.",
-    "failed.performance.ttfb.missing_url": "We could not get the TTFB for this page."
+    "failed.performance.ttfb.missing_url": "We could not get the TTFB for this page.",
+    "failed.content.too_long_sentence": "The page contains :actualValue sentences that are too long."
 }
\ No newline at end of file
diff --git a/src/Checks/Content/TooLongSentenceCheck.php b/src/Checks/Content/TooLongSentenceCheck.php
new file mode 100644
index 00000000..82c1e3c0
--- /dev/null
+++ b/src/Checks/Content/TooLongSentenceCheck.php
@@ -0,0 +1,109 @@
+<?php
+
+namespace Vormkracht10\Seo\Checks\Content;
+
+use Illuminate\Http\Client\Response;
+use Symfony\Component\DomCrawler\Crawler;
+use Vormkracht10\Seo\Interfaces\Check;
+use Vormkracht10\Seo\Traits\PerformCheck;
+
+class TooLongSentenceCheck implements Check
+{
+    use PerformCheck;
+
+    public string $title = 'Too long sentence check';
+
+    public string $priority = 'medium';
+
+    public int $timeToFix = 45;
+
+    public int $scoreWeight = 5;
+
+    public bool $continueAfterFailure = true;
+
+    public ?string $failureReason;
+
+    public mixed $actualValue = null;
+
+    public mixed $expectedValue = null;
+
+    public function check(Response $response, Crawler $crawler): bool
+    {
+        if (! $this->validateContent($crawler)) {
+            return false;
+        }
+
+        return true;
+    }
+
+    public function validateContent(Crawler $crawler): bool
+    {
+        $realSentences = [];
+        $sentences = $this->getSentencesFromCrawler($crawler);
+
+        $sentences = $this->separateSentencesByDot($sentences);
+
+        $sentencesWithTooManyWords = $this->calculateSentencesWithTooManyWords($sentences);
+
+        $this->actualValue = $this->calculateSentencesWithTooManyWords($sentences);
+
+        if (count($sentencesWithTooManyWords) === 0) {
+            return true;
+        }
+
+        // If more than 20% of the total sentences are too long, fail
+        if (count($sentencesWithTooManyWords) / count($sentences) > 0.2) {
+            $this->failureReason = __('failed.content.too_long_sentence', [
+                'actualValue' => count($this->actualValue),
+            ]);
+
+            return false;
+        }
+
+        return true;
+    }
+
+    private function separateSentencesByDot(array $sentences): array
+    {
+        $newSentences = [];
+
+        foreach ($sentences as $sentence) {
+            $sentence = explode('.', $sentence);
+            $newSentences = array_merge($newSentences, $sentence);
+        }
+
+        // Remove all sentences that are empty
+        $sentences = array_filter($newSentences, function ($sentence) {
+            return ! empty($sentence);
+        });
+
+        return $sentences;
+    }
+
+    private function getSentencesFromCrawler(Crawler $crawler): array
+    {
+        $content = $crawler->filterXPath('//body')->children();
+
+        // Get all elements that contain text
+        $content = $content->filterXPath('//*/text()[normalize-space()]');
+
+        $content = $content->each(function (Crawler $node, $i) {
+            return $node->text();
+        });
+
+        return $content;
+    }
+
+    private function calculateSentencesWithTooManyWords(array $sentences): array
+    {
+        $tooLongSentences = [];
+
+        foreach ($sentences as $sentence) {
+            if (str_word_count($sentence) > 20) {
+                $tooLongSentences[] = $sentence;
+            }
+        }
+
+        return $tooLongSentences;
+    }
+}
diff --git a/tests/Checks/Content/TooLongSentenceCheckTest.php b/tests/Checks/Content/TooLongSentenceCheckTest.php
new file mode 100644
index 00000000..8290a8ef
--- /dev/null
+++ b/tests/Checks/Content/TooLongSentenceCheckTest.php
@@ -0,0 +1,74 @@
+<?php
+
+use Illuminate\Support\Facades\Http;
+use Symfony\Component\DomCrawler\Crawler;
+use Vormkracht10\Seo\Checks\Content\TooLongSentenceCheck;
+
+it('can perform the too long sentence check on page with too long sentence', function () {
+    $check = new TooLongSentenceCheck();
+    $crawler = new Crawler();
+
+    $body = 'One two three four five six seven eight nine ten eleven twelve thirteen fourteen fifteen sixteen seventeen eighteen nineteen twenty twenty-one.';
+
+    Http::fake([
+        'vormkracht10.nl' => Http::response(
+            '<html>
+                <head>
+                    <title>Test</title>
+                </head>
+                <body>
+                    <p>'.$body.'</p>
+                </body>',
+            200),
+    ]);
+
+    $crawler->addHtmlContent(Http::get('vormkracht10.nl')->body());
+
+    $this->assertFalse($check->check(Http::get('vormkracht10.nl'), $crawler));
+});
+
+it('can perform the too long sentence check on page with no too long sentence', function () {
+    $check = new TooLongSentenceCheck();
+    $crawler = new Crawler();
+
+    $body = 'One two three four five six seven eight nine ten eleven twelve thirteen fourteen fifteen sixteen seventeen eighteen';
+
+    Http::fake([
+        'vormkracht10.nl' => Http::response(
+            '<html>
+                <head>
+                    <title>Test</title>
+                </head>
+                <body>
+                    <p>'.$body.'</p>
+                </body>',
+            200),
+    ]);
+
+    $crawler->addHtmlContent(Http::get('vormkracht10.nl')->body());
+
+    $check->check(Http::get('vormkracht10.nl'), $crawler);
+
+    $this->assertTrue($check->check(Http::get('vormkracht10.nl'), $crawler));
+});
+
+it('can perform the too long sentence check on page with no body', function () {
+    $check = new TooLongSentenceCheck();
+    $crawler = new Crawler();
+
+    Http::fake([
+        'vormkracht10.nl' => Http::response(
+            '<html>
+                <head>
+                    <title>Test</title>
+                </head>
+                <body></body>',
+            200),
+    ]);
+
+    $crawler->addHtmlContent(Http::get('vormkracht10.nl')->body());
+
+    $check->check(Http::get('vormkracht10.nl'), $crawler);
+
+    $this->assertTrue($check->check(Http::get('vormkracht10.nl'), $crawler));
+});