Complex sentence: In his narrative, Brown primarily discussed tribes including the Navahos, the Santee, Hunkpapa, and Oglala Sioux, Cheyennes, Apaches, and with less emphasis the Arapaho, Modoc, Kiowa, Comanche, Nez Percés, Ponca, Utes, and Minneconjou tribes.
Split into simpler sentences: In his narrative, Brown primarily discusses such tribes as the Navajo; the Santee, Hunkpapa, and Oglala Sioux; the Cheyennes, and the Apaches. He puts less emphasis on the Arapaho, Modoc, Kiowa, Comanche, Nez Perce, Ponca, Ute, and Minneconjou tribes.