Complex sentence: William Samuel Sadler (June 24,1875--April 26,1969) was an American psychiatrist and author who played a key role in the creation of the "The Urantia Book" and the spiritual and philosophical movement it spawned.
Split into simpler sentences: William Samuel Sadler (June 24,1875--April 26,1969) was an American psychiatrist and author. He played a key role in the creation of the "The Urantia Book", and the spiritual and philosophical movement it spawned.