Complex sentence: The 1948 U.S. Open was the 48th U.S. Open, held June 10--12 at Riviera Country Club in Pacific Palisades, California.
Split into simpler sentences: The 1948 U.S. Open was the 48th U.S. Open. The golf tournament was held June 10--12,1948, at Riviera Country Club in Pacific Palisades, California.