Complex sentence: He named it'Parthenope', in honor of his onetime principality in Naples, Italy, which had been founded on the site of the ancient Greek colonizers' settlement of Parthenope (see History of Naples).
Split into simpler sentences: He named it'Parthenope', in honor of his onetime principality in Naples, Italy. It was founded on the site of the ancient Greek settlement of Parthenope (see History of Naples).