Complex sentence: Marian begs Shane not to go; and, asks if he is doing it for her; and, he admits that he is, for her, and Joey, and all the decent people, who want a chance to live and grow up there.
Split into simpler sentences: Marian begs Shane not to go and asks if he is doing it for her. He admits that he is, and for Joey, and all the decent people who want a chance to live and grow up there.