Complex sentence: Score was traded to the Chicago White Sox after the 1959 season, and pitched parts of the following three seasons before retiring, finishing with a career record of 55--46 and a 3.36 ERA and 837 strikeouts over eight seasons, in 858 innings pitched.
Split into simpler sentences: Score was traded to the Chicago White Sox after the 1959 season, and pitched parts of the following three seasons before retiring. He finished with a major league career record of 55--46,3.36 ERA, and 837 strikeouts over eight seasons in 858 innings pitched.