Complex sentence: Defensive walls enclosed the settlement in the shape of a triangle, its apex located near the tower called Popov Toranj, and its base at the south end (the Strossmayer Promenade), which could be explained by the shape of the hill.
Split into simpler sentences: Defensive walls enclosed the settlement in the shape of a triangle. Its apex was located near the tower called Popov Toranj, and its base at the south end (the Strossmayer Promenade), which could be explained by the shape of the hill.