Complex sentence: Black Hawk's drawings include seventeen warfare scenes, seventeen natural history scenes featuring fifteen animal species, and numerous drawings of Lakota ceremonies, Black Hawk's spiritual visions, and depictions of Lakota cosmology.
Split into simpler sentences: Black Hawk's drawings include seventeen warfare scenes, seventeen natural history scenes, and numerous drawings of Lakota ceremonies. Also included in his illustrations are Black Hawk's spiritual visions, and depictions of Lakota cosmology.