Complex sentence: The Emu was classified in the family with their closest relatives the cassowaries in the family Casuariidae in the ratite order Struthioniformes, however, an alternate classification has been recently adopted splitting the Casuariidae into their own order Casuariformes.
Split into simpler sentences: The Emu was classified in the family with their closest relatives the cassowaries in the family Casuariidae in the ratite order Struthioniformes. However an alternate classification has been recently adopted splitting the Casuariidae into their own order Casuariformes.