Complex sentence: He became a free agent at the end of the season and signed a minor league contract with the Chicago White Sox, but on March 20,2009, was traded to the San Francisco Giants in exchange for future considerations.
Split into simpler sentences: He became a free agent at the end of the season and signed a minor league contract with the Chicago White Sox. On March 20,2009, Santos was traded by the Chicago White Sox to the San Francisco Giants in exchange for future considerations.