Complex sentence: Andrew Alm Benson was a professor of biology at the University of California, San Diego until his retirement in 1989, known for his work in understanding the carbon cycle in plants.
Split into simpler sentences: Andrew Alm Benson (born 1917 in Modesto, California) is an American biologist and a former professor of biology at the University of California, San Diego until his retirement in 1989. He is known for his work in understanding the carbon cycle in plants.