Complex sentence: Jaime anticipates that the men will try to rape Brienne and suggests she submit to their advances or face being killed, but concedes that if he were in Brienne's position he would make the men kill him.
Split into simpler sentences: Jaime anticipates that the men will try to rape Brienne and suggests she submit to their advances or face being killed. Despite his suggestion, Jaime admits that if he were in Brienne's position he would make the men kill him.