Complex sentence: His 1,119 career games pitched is an NL record, and ranks fourth in major league history; his 424 career saves ranked second in major league history when he retired, and remains the most by a left-hander.
Split into simpler sentences: His 1,119 career games pitched is an NL record, and ranks fourth in major league history. His 424 career saves ranks fifth all-time in major league history (ranking second when he retired), and remains the most by a left-hander.