An accurate definition of tenebrism would be that it is marked by a very strong contrast between light and dark tones, imagine like when people tell ghost stories and everything's dark but they point a flashlight to their faces. The darkness is the dominating feature but the light is there as a sharp contrast. This is what tenebrism was and what Caravaggio did all the time.
Compound. if there is two sentences or for example" I like flowers, but I'm allergic to lillies." would be a compound a simple sentence is like "that flower is blue."
