Complex sentence: Persian military and naval operations to quell the revolt ended in the Persian reoccupation of Ionian and Greek islands; however, anti-Persian parties gained more power in Athens, and pro-Persian aristocrats were exiled from Athens and Sparta.
Split into simpler sentences: Persian military and naval operations to quell the revolt ended in the Persian reoccupation of Ionian and Greek islands. However, anti-Persian parties gained more power in Athens, and pro-Persian aristocrats were exiled from Athens and Sparta.