Conversation so far:
How did the program help Bill W.?
It helped him obtain sobriety.
How long was Bill W. in the program?
What did Bill W. accomplish while in the spiritual program?
In 1938, after about 100 alcoholics in Akron and New York had become sober, the fellowship decided to promote its program of recovery through the publication of a book.

Question: how did he help others with alcohol??
Self-contained rewrite: How did Bill W. help others with alcohol?