text: The war also wrought subtler changes to Greek society ; the conflict between democratic Athens and oligarchic Sparta , each of which supported friendly political factions within other states , made civil war a common occurrence in the Greek world .
simplified: p488 The war also wrought subtler changes to Greek society ; the conflict between democratic Athens and oligarchic Sparta , each of which supported friendly political factions within other states , made civil war a common occurrence in the Greek world .