Dumbing down the explanation so as to make it more understandable to your audience, only gets you so far.
The audience itself, has to make some 'effort' to understand, by asking the right questions, filling in the 'holes' in their understanding if you will.
We all had the same teachers as 20-25 other people, in school, yet some learned more and some learned less.
IOW some put in more effort, and some less ( or no ) effort.
( I, myself, was accused, by Dr. G Kidson, in Uni, of being a 'coaster', and not putting in enough effort )