Complex sentence: Sometime after the outbreak Negan established himself as the ruthless dictator of a community of survivors called the "Saviors", wielding a baseball bat wrapped in barbed wire he called "Lucille".
Split into simpler sentences: Sometime after the outbreak, Negan established himself as the ruthless dictator of a community of survivors called the "Saviors". He wields a baseball bat wrapped in barbed wire, that he calls "Lucille".