Complex sentence: It can also be mistaken for a small beaver, as beavers and coypus have very similar anatomies; beavers' tails are flat and paddle-like, as opposed to the round rat-like tails of coypu.
Split into simpler sentences: It can also be mistaken for a small beaver, as beavers and coypus have very similar anatomies;. However, beavers' tails are flat and paddle-like, as opposed to the round rat-like tails of coypu.