What does this mean?
The content on your page may be difficult to read. There are plenty of algorithms that are designed to measure content readability (that’s what robots or search engines use too).
One of the most popular algorithms for calculating content readability is the Flesch-Kincaid readability score. Other algorithms include Gunning-Fog, Coleman-Liau, SMOG index, etc.
What to do?
You need to improve the readability of your content.
Learn more here: https://cxl.com/blog/9-key-steps-to-improve-website-readability/