Sentence examples for are much less understandable from inspiring English sources

The phrase "are much less understandable" is correct and usable in written English.
It can be used when comparing the clarity or comprehensibility of two or more subjects, indicating that one is significantly harder to understand than the other.
Example: "The instructions provided in the manual are much less understandable than those given in the video tutorial."
Alternatives: "are significantly harder to comprehend" or "are far less clear."