Complex sentence: In 375 BCE Athens mounted two successful expeditions-one to the north Aegean under Chabrias and a second round the Peloponnese to western Greece under Timotheos, son of Conon, who won the battle of Alyzeia in Acarnania.
Split into simpler sentences: In 375 BCE Athens mounted two successful expeditions-one into the northern Aegean under Chabrias and a second which sailed around the Peloponnese to western Greece. This force was led by Timotheos, son of Conon, who won the battle of Alyzeia in Acarnania.