Conclusion: My personal advice to you is don’t let this kind of analysis affect the way you like. For as long as your content is really good and it makes sense, and people are actually learning, no one is going to care with your sentence if it has 21 words or more. No one is even going to count. Again, don’t obsessed with trying to get your Readability score to green. Having an orange readability article is okay for as long as the people who reads your article are loving it and they actually learned a few things from it and they find your article useful.