Complex sentence: He settled down, bringing his ERA down to a far more respectable 3.91 and earning 22 saves by season's end, but his 9-11 mark was the first losing record he had posted in his major league career.
Split into simpler sentences: He settled down, bringing his ERA down to a far more respectable 3.91 and earning 22 saves by season's end. His 9-11 mark was the first losing record he had posted in his major league career.