Conversation so far:
When did Steven Seagal start martial arts?
Seagal moved to Japan at some point between 1971 and 1973.
Why did he move to Japan?
CANNOTANSWER.
DId he make any movies while in Japan?
CANNOTANSWER.

Question: What did he do that had to do with martial arts?
Self-contained rewrite: What did Steven Seagal do that had to do with martial arts