Complex sentence: Napflion and Monemvassia were the only two Venetian possessions remaining in the Peloponnese and the road was open more than ever for the Ottoman Turks to move on the Venetian possessions in the Ionian Islands of Zakynthos and Kerkyra who were now inadequately defended.
Split into simpler sentences: Napflion and Monemvassia were the only two Venetian possessions remaining in the Peloponnese. The road was open more than ever for the Ottoman Turks to move on the Venetian possessions in the Ionian Islands of Zakynthos and Kerkyra who were now inadequately defended.