Complex sentence: Okano was on the panel of Masters of the Japan Karate-do Federation (JKF) and was declared a Living National Treasure of Japan before he died on July 19,2003, at the age of 81.
Split into simpler sentences: Okano was on the panel of Masters of the Japan Karate-do Federation (JKF). He died on July 19,2003, at the age of 81.