Complex sentence: The 2016 United States Open Championship was the 116th U.S. Open, held June 16--19 at Oakmont Country Club in Plum, Pennsylvania, a suburb northeast of Pittsburgh.
Split into simpler sentences: The 2016 United States Open Championship was the 116th U.S. Open. It began on June 16 and ended on June 19 at Oakmont Country Club in Plum, Pennsylvania, a suburb northeast of Pittsburgh.