Conversation so far:
Did Theo Epstein ever join the Red Sox?
Epstein remained in contact with the team's front office and on January 12, 2006, he and Red Sox management announced his return.
What was his job with the Red Sox?
Six days later, the team announced that he would resume the title of general manager and add the title of executive vice president.
How did the Red Sox do while Epstein was there?
Epstein traded Kason Gabbard and minor league outfielders David Murphy and Engel Beltre to the Texas Rangers for Gagne on July 31, 2007.

Question: How did Epstein improve the team?
Self-contained rewrite: How did Epstein improve the Red Sox?