Complex sentence: Muslim villages were attacked, looted, and torched, and Ottoman rule collapsed across western Continental Greece: by the end of the month, the Ottomans only held on to the coastal fortresses of Preveza and Vonitsa.
Split into simpler sentences: Muslim villages were attacked, looted, and torched, and Ottoman rule collapsed across western Continental Greece. By the end of the month the Ottomans only held on to the coastal fortresses of Preveza and Vonitsa.