Complex sentence: During the Peloponnesian War (431-404 BC) Cyzicus was subject to the Athenians and Lacedaemonians alternately, and at the peace of Antalcidas (387 BC), like the other Greek cities in Asia, it was made over to Persia.
Split into simpler sentences: During the Peloponnesian War (431-404 BC) Cyzicus was subject to the Athenians and Lacedaemonians alternately. At the peace of Antalcidas (387 BC), like the other Greek cities in Asia, it was made over to Persia.