Complex sentence: The best period of the principality was under Dhimiter Progoni, the third and the last Prince of Albania from the Progon Dynasty, reigning between 1208 and 1216.
Split into simpler sentences: The best period of the principality was under Dhimiter Progoni. Dhimitër Progoni was the third and the last Prince of Albania from the Progon Dynasty, reigning between 1208 and 1216.