Complex sentence: He becomes the leader by default, and cats begin to seek his advice--and aid; a group of rogues from the forest wander in, and begin bullying and abusing the local cats, who turn to their leader, Scourge, for protection.
Split into simpler sentences: He becomes the leader by default, and cats begin to seek his advice and aid. A group of rogues from the forest wander in and begin bullying and abusing the local cats, who turn to their leader, Scourge, for protection.