Complex sentence: In 2003 the Sox set ML records for extra-base hits, total bases and slugging, finishing one off the major league lead with 238 home runs, and tied a ML record with 373 doubles in 2004.
Split into simpler sentences: In 2003 the Sox set ML records for extra-base hits, total bases and slugging, finishing one off the major league lead with 238 home runs. The Red Sox tied a ML record with 373 doubles in 2004.