Which type of sentence is this?
Leonardo da Vinci, who was a renowned painter and sculptor, was also an inventor and scientist.

 - compound
 - complex
 - compound-complex
 - simple
The sentence is complex. It is made up of an independent clause and a dependent clause. The dependent clause begins with the relative pronoun who.
Leonardo da Vinci, who was a renowned painter and sculptor, was also an inventor and scientist.