Complex sentence: Joe is moody and rebellious and needs a strong father figure to guide him and keep him in line, but Douglas is ineffectual and emotionally weak, and when Joe witnesses Douglas committing suicide, it sends the young man over the edge.
Split into simpler sentences: Joe is moody and rebellious and needs a strong father figure to guide him and keep him in line. But Douglas is ineffectual and emotionally weak, and when Joe witnesses Douglas committing suicide, it sends the young man over the edge.