Complex sentence: Hollywood Arms is about real people who fight or let one another down, jab and jeer, needle and explode, but also, when need be, help people who are sarcastic or pathetic failures, impoverished and disappointed.
Split into simpler sentences: Hollywood Arms is about real people who fight or let one another down, jab and jeer, needle and explode, but also, when need be, help. People who are sarcastic or pathetic failures, impoverished and disappointed.