oversimplify

To simplify to the point of causing misrepresentation, misconception, or error.

To cause distortion or error by extreme simplification of a subject.

to simplify excessively so as to distort or misrepresent; — of facts, assertions, or communications.

To explain or present something in a way that excludes important information for the sake of brevity, or of making the explanation or presentation easy to understand.

simplify to an excessive degree

make too simple