Complex sentence: The 1938 U.S. Open was the 42nd U.S. Open, held June 9--11 at Cherry Hills Country Club in Englewood, Colorado, a suburb south of Denver.
Split into simpler sentences: The 1938 U.S. Open was the 42nd U.S. Open. The golf tournament was held June 9--11,1938, at Cherry Hills Country Club in Englewood, Colorado, a suburb south of Denver.