Complex sentence: Bartz and Membrok, Chieftains of the Cuman tribes settled down in the territories west of the Dniester River, were baptized and they acknowledged the overlordship of King Béla IV of Hungary around 1228.
Split into simpler sentences: Bartz and Membrok, chieftains of the Cuman tribes, settled down in the territories west of the Dniester River. They were baptized, and they acknowledged the overlordship of King Béla IV of Hungary around 1228.