Complex sentence: Fortunately, many of the civilians of Methoni had been evacuated to Zakynthos before the battle as for the rest, the Ottoman Turks showed no mercy and massacred the defenders that had survived their assault.
Split into simpler sentences: Fortunately, many of the civilians of Methoni had been evacuated to Zakynthos before the battle. As for the rest, the Ottoman Turks showed no mercy and massacred the defenders that had survived their assault.