Using fancy words isn't the way to impress. Since you're asking other people for some words, there's a higher chance that you'll accidentally use them wrong. What you're saying is what matters. Whether or not you're able to get your point across is what matters and using "fancy" words isn't going to help with that. I bet what you have is great. Just make sure you're getting your point across and you'll be fine.
Answer:
A simple sentence consists of only one clause. A compound sentence consists of two or more independent clauses. A complex sentence has at least one independent clause plus at least one dependent clause. ... Sentence 4 is compound-complex (also known as complex-compound).
