Conversation so far:
When did Clemens return to the yankees?
Clemens made his 2007 return on June 9.
How did he perform with the yankees?
On July 2, Clemens collected his 350th win against the Minnesota Twins at Yankee Stadium.
did he play in the postseason?
CANNOTANSWER.

Question: how long was he with the yankees?
Self-contained rewrite: How long was Roger Clemens with the Yankees?