Complex sentence: Both the military and their auxiliaries the Rondas Campesinas committed human rights atrocities against their enemies, but it must be said that the Maoists were no less ruthless, and sought to enforce their totalitarian ideology by committing acts of terrorism against the civilian population.
Split into simpler sentences: Both the military and their auxiliaries the Rondas Campesinas committed human rights atrocities against their enemies. The Maoists were no less ruthless, and sought to enforce their totalitarian ideology by committing acts of terrorism against the civilian population.