Complex sentence: Irwin's first U.S. Open triumph came at Winged Foot in 1974, and he added a second U.S. Open title at Inverness Club in 1979.
Split into simpler sentences: Irwin's first U.S. Open triumph came at Winged Foot in 1974. Irwin added a second U.S. Open title at Inverness Club in 1979.