Complex sentence: Since at least the French revolution, we have collected a frightening register of extremely violent events in the context of civil wars, and such apparent massive irrational behaviour among combatants and civilians (a sort of unexpected Hobbesian disease) has been widely examined by the literature.
Split into simpler sentences: Since at least the French revolution, we have collected a frightening register of a good amount of extremely violent events in the context of civil wars. And such apparent massive irrational behaviour among combatants and civilians (a sort of unexpected Hobbesian disease) has been widely examined by the literature.