Complex sentence: Harvey Williams Cushing (April 8,1869--October 7,1939), was an American neurosurgeon and a pioneer of brain surgery, and the first to describe Cushing's syndrome.
Split into simpler sentences: Harvey Williams Cushing (April 8,1869--October 7,1939) was an American neurosurgeon. A pioneer of brain surgery, he was the first person to describe Cushing's syndrome.