Conversation so far:
What did Robert Crumb do in 1962?
Robert Crumb's father gave him $40 when he left home after high school.
What did Robert Crumb do when he left home after high school?
Robert Crumb's first job, in 1962, was drawing novelty greeting cards for American Greetings in Cleveland, Ohio.
How long did Robert Crumb draw novelty greeting cards for American Greetings?
Robert Crumb stayed with the American Greetings company for four years.
What did Robert Crumb do after working for American Greetings for four years?
Dissatisfied with greeting card work, Robert Crumb tried to sell cartoons to comic book companies.

Question: Was he successful?
Self-contained rewrite: Was Robert Crumb successful in trying to sell cartoons to comic book companies?