Conversation so far:
When did Steven Seagal get involved in martial arts?
Steven Seagal  started studying martial arts under Fumio Demura when he was a child.
What kind of martial arts was Steven Seagal doing?
Steven Seagal trained in aikido, karate, judo and kendo.
Who did Steven Seagal train with?
Steve Seagal started studying martial arts under Fumio Demura when he was a child. Seagal later traveled to Japan at the age of 17 where he perfected his martial arts.
Did Steven Seagal earn a black belt?
Steven Seagal eventually earned black belts in aikido, karate, judo and kendo.
What other accomplishments did Steven Seagal have in his martial arts training besdies earning black belts?
Steve Seagal taught at the school owned by then wife Miyako's family (though he is often stated to have been the first non-Asian to open a dojo in Japan).

Question: Was this successful?
Self-contained rewrite: Was the school owned by Steven Seagal's then wife Miyako's family successful?