Complex sentence: Larry M. Christiansen (born June 27,1956) is a chess Grandmaster who grew up in Riverside, California, United States, becoming the U.S. champion in 1980,1983, and 2002.
Split into simpler sentences: Larry M. Christiansen (born June 27,1956) is a chess Grandmaster who grew up in Riverside, California. He was U.S. champion in 1980,1983, and 2002.