Complex sentence: The 1983 U.S. Open was the 83rd U.S. Open, held June 16--20 at Oakmont Country Club in Oakmont, Pennsylvania, a suburb northeast of Pittsburgh.
Split into simpler sentences: The 1983 U.S. Open was the 83rd U.S. Open. The golf tournament was held June 16--20,1983, at Oakmont Country Club in Oakmont, Pennsylvania, a suburb northeast of Pittsburgh.