Complex sentence: Having the appearance of a 3-meter (10-foot) long mammalian crocodile, Ambulocetus weighed between 440 (200 kg) and 660 lbs (300 kg).
Split into simpler sentences: Having the appearance of a 3-meter (10-foot) long mammalian crocodile. It weighed between 440 (200 kg) and 660 lbs (300 kg).