Complex sentence: Vernon Orlando Bailey (1864--1942) was an American mammalogist employed by the Bureau of Biological Survey, known today as the United States Fish and Wildlife Service, and formerly a division of the United States Department of Agriculture (USDA).
Split into simpler sentences: Vernon Orlando Bailey (1864--1942) was an American nauturalist who specialist in mammalogy. He was employed by the Bureau of Biological Survey, United States Department of Agriculture (USDA).