Conversation so far:
Where did Billy Southworth go to school?
CANNOTANSWER.
When did he start playing?
At the age of 19, he signed a contract with the Portsmouth team in the Ohio State League.
How long did he play for them?
He joined the Cleveland Indians in 1913, but only appeared in one game, entering as a replacement on defense.
Did he play for anyone else?
The elder Southworth returned to the Cleveland Indians in 1915 and appeared in 60 games.

Question: When did he start coaching instead of playing?
Self-contained rewrite: When did Billy Southworth start coaching instead of playing?