Complex sentence: The caste system arose during this period, creating a hierarchy of priests, warriors, free peasants and traders, and lastly the indigenous peoples who were regarded as impure; and small tribal units gradually coalesced into monarchical, state-level polities.
Split into simpler sentences: The caste system arose during this period, creating a hierarchy of priests, warriors, free peasants and traders, and lastly the indigenous peoples who were regarded as impure. Small tribal units gradually coalesced into monarchical, state-level polities.