Complex sentence: Senior PGA Championship-Playing in his first Champions Tour event, Michael Allen won by two shots over Larry Mize, becoming the first player since Jack Nicklaus in 1990 to win a major in his Champions Tour debut.
Split into simpler sentences: Senior PGA Championship-Playing in his first Champions Tour event, Michael Allen wins by two shots over Larry Mize. Allen becomes the first player since Jack Nicklaus in 1990 to win a major in his Champions Tour debut.