Complex sentence: The Arno river dog has been described as a small jackal-like dog and its anatomy and morphology relates more to the modern golden jackal "Canis aureus" than to the larger Etruscan wolf of that time.
Split into simpler sentences: The Arno river dog has been described as a small jackal-like dog. Its anatomy and morphology relate it more to the modern golden jackal "Canis aureus" than to the larger Etruscan wolf of that time.