Complex sentence: Superficially, the Characiformes somewhat resemble their relatives of the order Cypriniformes, but have a small fleshy adipose fin between the dorsal fin and tail.
Split into simpler sentences: Superficially, the Characiformes somewhat resemble their relatives of the order Cypriniformes. One noticeable difference is the presence of a small fleshy adipose fin between the dorsal fin and tail.