Simple is not shallow. Simple is not lazy. Simple is not uneducated.
Simple doesn't mean you can't say more, simple means you choose not to say more. Simple doesn't mean you don't know more, simple means you choose not to share everything you know. Simple doesn't mean you can't talk longer, simple means you choose not to talk longer because you understand that longer doesn't always mean better!
When it comes to communication, simple is helpful. Simple is understandable. Simple is palatable.
Simplicity serves your listeners. Complexity doesn't.
Simple shows you care. Simple shows you're willing to work hard to prepare so your listener doesn't have to work hard to understand. Simple reveals you're more interested in what the audience understands than in how you're perceived.
Keep your communication simple.
The strength in your communication is not in what is said, but in what is understood.