Complex sentence: The oldest fossils date to the early Eocene, around 50 million years ago; classified in the genus "Limnofregata", the three species had shorter less-hooked bills and longer legs, and lived in a freshwater environment.
Split into simpler sentences: The oldest fossils date to the early Eocene, around 50 million years ago. Classified in the genus "Limnofregata", the three species had shorter less-hooked bills and longer legs, and lived in a freshwater environment.