Complex sentence: It features three tribal nations, the Hopi, the Winnemem Wintu, and the Lakota Sioux, and their struggles to protect three sacred sites that are central to their understanding of the world and their spiritual responsibilities to care for their homelands.
Split into simpler sentences: It features three tribal nations, the Hopi, the Winnemem Wintu, and the Lakota Sioux, and their struggles to protect three sacred sites. Such sites are central to their understanding of the world and their spiritual responsibilities to care for their homelands.