Conversation so far:
What was Raymond Berry's first coaching job ?
After retiring from playing, Raymond Berry joined Tom Landry's Dallas Cowboys coaching staff as receivers coach.
What year did Raymond Berry join the Dallas Cowboys ?
Raymond Berry joined Tom Landry's Dallas Cowboys coaching staff as receivers coach in 1968.

Question: How many years did he work for Frank Broyles?
Self-contained rewrite: How many years did Raymond Berry work for Frank Broyles?