Complex sentence: The development of the throwing-spear, together with ambush hunting techniques, made potential violence between groups very costly, dictating conflict avoidance, which involved groups moving apart as far as possible to alleviate resource competition.
Split into simpler sentences: The development of the throwing-spear, together with ambush hunting techniques. This made potential violence between groups very costly, dictating conflict avoidence, which involved groups moving apart as far as possible to alleviate resource competition.