Complex sentence: Some humans would ally with the Invid in exchange for power, while criminal gangs, self-appointed leaders and a variety of cults took power in areas not under Invid control while other areas of the planet reverted to simple hunter-gather socities.
Split into simpler sentences: Some humans would ally with the Invid in exchange for power, while criminal gangs, self-appointed leaders and a variety of cults took power in areas not under Invid control. Some areas of the planet reverted to simple hunter-gather socities.