Complex sentence: Fred Hultstrand (September 13,1888--June 28,1968) was a professional photographer whose work helped document life in the U.S. state of North Dakota in the early 20th century.
Split into simpler sentences: Fred Hultstrand (September 13,1888--June 28,1968) was a professional photographer. His photography helped document life in the U.S. state of North Dakota in the early 20th century.