Complex sentence: Pullo, fearful that the reprimand will start a gang war, begs Vorenus to reconsider and let him broker a peace; however, Vorenus is unreasonable and becomes enraged, telling Pullo if he is not with him, he is against him.
Split into simpler sentences: Pullo, fearful that the reprimand will start a gang war, begs Vorenus to reconsider and let him broker a peace. However, Vorenus is unreasonable and becomes enraged, telling Pullo if he is not with him, he is against him.