boil it down to 3rd grade level and reckon with the fact that nuance is lost. most people don't know words, you may as well speak klingon. actually it's worse than that, since they view words they don't understand as a pompous display and that means they will have a negative view of you by default and are not likely to even try to understand. You think I talk like this for fun? no, I talk like this because i want to be understood, and i find that my masturbatory desire to use "just the right word" and egocentric drive to acquire words to show superiority were standing in the way of expression. the danger of course is you will risk losing vocabulary doing this. but if you want comprehension, it's literally the only way.
Of course you can adjust your language for audience. Well i mean it's possible to, but probably not for some with >9000lvl autism.