Complex sentence: Both species are similar to true cheetahs, with faces shortened and nasal cavities expanded for increased oxygen capacity, and legs proportioned for swift running, however these similarities are parallel rather than inherited from a common ancestor.
Split into simpler sentences: Both species are similar to true Cheetahs, with faces shortened and nasal cavities expanded for increased oxygen capacity, and legs proportioned for swift running. However, these similarities are parallel rather than inherited from a common ancestor.