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dumb (something) down
To make something less complicated to accommodate a less intelligent, educated, or sophisticated audience. The professor decided to dumb down the course material a bit after most of his class failed the first exam. I think we ought to dumb the play down a bit; after all, most of the people coming to see it won't have a PhD in drama.
To simplify something excessively in order to make it suitable for a less educated or less sophisticated audience: The researchers dumbed down the report before releasing it to the public.
dumb down, to
To simplify or otherwise revise in order to appeal to someone of less education, taste, or intelligence. This slangy expression dates from the first half of the 1900s. Publishers Weekly used it in a review of The Business of Books by André Schiffrin: “. . . the attempt to appeal to the lowest common denominator of taste, which has, he says, led network television and movies in such depressing directions, has dumbed down publishing to an alarming degree” (Aug. 21, 2000).
See also: dumb