Complex sentence: Lightner Witmer (June 28,1867--July 19,1956) was an American psychologist who introduced the term "clinical psychology" and is often credited with founding the field that it describes.
Split into simpler sentences: Lightner Witmer (June 28,1867--July 19,1956) was an American psychologist. He introduced the term "clinical psychology" and is often credited with founding the field that it describes.