Complex sentence: Prior to the arrival of Europeans, Panama was widely settled by Chibchan, Chocoan, and Cueva peoples, among whom the largest group were the Cueva (whose specific language affiliation is poorly documented).
Split into simpler sentences: Prior to the arrival of Europeans, Panama was widely settled by Chibchan, Chocoan, and Cueva peoples. The largest group were the Cueva (whose specific language affiliation is poorly documented).