Now that's a gross oversimplification of his assertion, but the point is useful.
From the avc.com
It is a gross oversimplification of a confused, confusing, and tragic situation.
From the economist.com
It is oversimplification and inaccurate to talk about equal pay for equal work.
From the economist.com
That is a gross oversimplification of most any security scenario and you know it.
From the economist.com
I removed it because it is an oversimplification, and it is not properly sourced.
From the en.wikipedia.org
The hierarchical model is an oversimplification of the hormonal signaling process.
From the en.wikipedia.org
To reduce belief to a single word, fear, is surely a gross oversimplification.
From the newscientist.com
The aforementioned remarks are an oversimplification of psychoanalytic theory.
From the psychcentral.com
Deepak Gupta, a lawyer for the plaintiffs, called that an oversimplification.
From the nytimes.com
More examples
An act of excessive simplification; the act of making something seem simpler than it really is
A simplification that goes too far (to the point of misrepresentation)
(oversimplify) simplify to an excessive degree; "Don't oversimplify the problem"
The fallacy of the single cause, also known as joint effect or causal oversimplification, is a logical fallacy of causation that occurs when it is assumed that there is a single, simple cause of an outcome when in reality it may have been caused by a number of only jointly sufficient causes.
(oversimplified) Having been simplified to the point where important information is not conveyed
(oversimplify) 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
Reducing a complex situation to a simple, inaccurate statement.
Favorable generalities are used to provide simple answers to complex social, political, economic, or military problems.