Complex sentence: Principality of Dukagjini (1387 --) was a principality in Medieval Albania which stretched over Zadrima, areas north and north-east of Shkodra, and Kosovo, with Ulpiana (close to modern-day Pristina) being its second capital.
Split into simpler sentences: Principality of Dukagjini (1387 --) was a principality in Medieval Albania. The Principality stretched over Zadrima, areas north and north-east of Shkodra, and Kosovo, with Ulpiana (close to modern day Pristina) being its second capital.