What is the word for "over-simplifying an explanation"?

I am looking for a word (or phrase, I suppose) that means/implies that an explanation of a deeply technical subject is over-simplified almost to the point of inaccuracy in order to convey a particular concept.

The borderline technical fallacies might be elaborated or clarified later on, but for the time of the original explanation, they are intentionally left vague or inaccurate.

An example might be trying to explain how to bake a chocolate cake. I might use a simplified explanation of saying that you must combine and bake butter, eggs, sugar, flour, cocoa powder, and baking soda.

But in reality if you combined them all then baked them, you wouldn't end up with anything remotely close to a chocolate cake, because there is a specific order in which all the individual ingredients must be combined before you end up with a real chocolate cake.

edit: I'm looking for a word (preferably) or a phrase (if a single word doesn't exist for the concept) that implies both the simplification of a concept, as well as it being for the purpose of conveying a specific concept. My cake analogy may not be the best, I'll try to think of a better one and edit this question if I do.

Watered Down is used to denote when something is simplified. Now, how simplified it may be is largely subjective.

High school students will receive a watered down version of Newton's laws and special relativity.

Scientific papers almost always include abstracts, an outline of the problem addressed, methods used, and results obtained. Capsule biographies lay out only the major events in a person's life without going into detail about them. A synopsis explains what a book or movie is about a few paragraphs or less. There are also summaries, outlines, and thumbnail sketches. A common heading for such things is "At a Glance."

Reading your question, something that comes to mind is Layman's Terms, a phrase derived from layman, which is defined as a person who is not of a particular profession.

In the case of a mechanic, it might be quicker and get the point across to a customer to say that a gasket or a brake pad broke, when this is not exactly the case. Talking to another mechanic, they'll say the gaskets leak and the pads are worn, but all that matters to the customer (the layman, in this case) is that it won't work and needs to be replaced or fixed.