Conversation so far:
Did Theo Epstein ever join the Red Sox?
After leaving the position as the Padres' President, Lucchino became president and chief executive officer of the Red Sox on November 15, 2001 and hired Epstein to work under him.
What was Theo Epstein's job with the Red Sox?
General manager
How did the Red Sox do while Epstein was there?
THe Red Sox won their first champtionship since 1918.

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