https://www.webfx.com/tools/read-able/check.php
There are a number of machine readability widgets online. They make for quite a satisfying way to check the before and after of a piece of text you might be editing. Reds are bad, greens are good. The report on the left was for the URL of a law firm. The report on the right is the the readability index of the copycourse site. Why make life difficult for your readers?