Complex sentence: She first found success as an amateur golfer, beginning by winning the high school State Championship three years straight for Manhattan High School (1979-1981), then winning the Kansas Women's Amateur each of the next two years (1982,1983).
Split into simpler sentences: She first found success as an amateur golfer, beginning by winning the high school State Championship three years straight for Manhattan High School (1979-1981). She followed by winning the Kansas Women's Amateur each of the next two years (1982,1983).