Complex sentence: The Amsterdam wigeon ("Anas marecula"), also known as the Amsterdam Island duck or Amsterdam duck, was a species of anatid waterfowl, endemic to Île Amsterdam (Amsterdam Island), French Southern Territories.
Split into simpler sentences: The Amsterdam wigeon ("Anas marecula"), also known as the Amsterdam Island duck or Amsterdam duck, was a species of waterfowl in the Anatidae family. It was endemic to Île Amsterdam (Amsterdam Island), French Southern Territories.