Complex sentence: In 1961 the Korean government initiated a movement to unify all of the martial arts schools in existence under one governing body, to be called the Korean Tae Soo Do Association, only later to be renamed the Korean Tae Kwon Do Association.
Split into simpler sentences: In 1961 the Korean government initiated a movement to unify all of its country's martial arts schools under one governing body. This body would originally be called the Korean Tae Soo Do Association and later renamed the Korean Tae Kwon Do Association.