Most people make simple problems and solutions very complex. Anybody can do that. Experts make the complex problems and solutions simple. They can clearly and concisely explain things in layman‘s terms and don’t have to use fancy words or industry jargon to try to prove their intelligence.
Work on listening more and speaking less. When you speak, do it clearly, concisely, and with confidence. Simplify your answer as much as is required – no more, no less.