Complex sentence: He examines what he terms "Holmberg's mistake", named for the anthropologist Allan R. Holmberg, who lived among the Siriono in the 1940s and came to the conclusion that they were the most "culturally backward peoples" in the world.
Split into simpler sentences: He examines what he terms "Holmberg's mistake", named for the anthropologist Allan R. Holmberg, who lived among the "Siriono" in the 1940s. Holmberg concluded they were the most "culturally backward peoples" in the world.