Conversation so far:
What was Stan Kenton's career like?
As a pianist, composer, arranger and band leader Stan Kenton led an innovative and influential jazz orchestra for almost four decades.
Who was Gus Arnheim?
Gus Arnheim was an American pianist, and Stan Kenton was in his band before he departed.

Question: What did Kenton do after that?
Self-contained rewrite: What did Stan Kenton do after he departed from Gus Arnheim's band?