Complex sentence: In 1430 an Ottoman army, fresh from the capture of Thessalonica, appeared before Ioannina, and the city surrendered soon after, after its commander, Sinan Pasha, promised to spare the city and respect its autonomy.
Split into simpler sentences: In 1430 an Ottoman army, fresh from the capture of Thessalonica, appeared before Ioannina. The city surrendered after the Ottoman commander, Sinan Pasha, promised to spare the city and respect its autonomy.