Complex sentence: The 1970 U.S. Open Championship was the 70th U.S. Open played June 18--21 at Hazeltine National Golf Club in Chaska, Minnesota.
Split into simpler sentences: The 1970 U.S. Open was the 70th U.S. Open. It was played between June 18-21,1970, at Hazeltine National Golf Club in Chaska, Minnesota.