Complex sentence: The 1971 U.S. Open Championship was the 71st U.S. Open played June 17-21 at Merion Golf Club (East Course) in Ardmore, Pennsylvania.
Split into simpler sentences: The 1971 U.S. Open was the 71st U.S. Open. It was played between June 17-21,1971, at Merion Golf Club in Ardmore, Pennsylvania.