Complex sentence: Leucippus was an Ionian Greek (Ionia, now part of western Turkey) as was Anaxagoras, and a contemporary of Zeno of Elea and Empedocles (Magna Graecia, now part of southern Italy).
Split into simpler sentences: Leucippus was an Ionian Greek (Ionia, now part of western Turkey), as was Anaxagoras. And he was a contemporary of Zeno of Elea and Empedocles (Magna Graecia, now part of southern Italy).