Complex sentence: Dvigrad is situated in Draga-a deep valley that stretches from Pazin to the sea, ending in the Lim sea channel, that marked the border between the Pula and Poreč territories.
Split into simpler sentences: Dvigrad is situated in Draga-a deep valley that stretches from Pazin to the sea, ending in a sea channel. Lim served as a border between the Pula and Poreč territories.