If you can’t explain it simply, you probably don’t understand it well enough.
Students come to me often and say, “I want to use more complicated sentences, like a native speaker.”
Expressing yourself well does not mean using complicated sentences.
Actually, it usually means the opposite. Expressing yourself well means understanding your idea so well that you can express it simply.
Steve Jobs spoke at a fifth grade level. That means a 12-year old could understand him.
Jack Welch said, “[People] worry that if they’re simple, people will think they’re simple-minded. In reality, of course, it’s just the reverse.”
Remember, your objective is not to impress your audience. It’s to get them to do something.