Conversation so far:
When did you join the Red Sox?
CANNOTANSWER.
Was the Red Sox his first team?
CANNOTANSWER.
What is something interesting about his time with the Red Sox?
The 1986 ALCS clincher was Clemens' first postseason career victory.
He did not win his second until 13 years later.

Question: What was his average during his time with the Red Sox?
Self-contained rewrite: What was Roger Clemens' average during his time with the Red Sox?