Complex sentence: The 1964 U.S. Open Championship was the 64th U.S. Open played June 18-20 at Congressional Country Club (Blue Course) in Bethesda, Maryland.
Split into simpler sentences: The 1964 U.S. Open was the 64th U.S. Open. It was played between June 18-20,1964, at Congressional Country Club in Bethesda, Maryland.