Complex sentence: The 1960 U.S. Open was the 60th U.S. Open, held June 16--18 at Cherry Hills Country Club in Englewood, Colorado, a suburb south of Denver.
Split into simpler sentences: The 1960 U.S. Open was the 60th U.S. Open. The golf tournament was held June 16--18,1960, at Cherry Hills Country Club in Englewood, Colorado, a suburb south of Denver.