Complex sentence: He was initially a member of the oligarchy which ruled Naxos and in 546 BCE Lygdamis supported the former Athenian tyrant Peisistratos in his landing at Marathon which led to the restoration of Peisistratos to power in Athens.
Split into simpler sentences: He was initially a member of the oligarchy which ruled Naxos. In 546 BCE, Lygdamis supported the former Athenian tyrant Peisistratos in his landing at Marathon which led to the restoration of Peisistratos to power in Athens.