Complex sentence: It is one of the fastest growing Shotokan associations in the world, with recent estimates that JSKA has a world wide membership of over 750,000 students in more than 70 countries internationally.
Split into simpler sentences: It is one of the fastest growing Shotokan associations in the world. Most recent estimates state that JSKA has a world wide membership of over 750,000 students in more than 70 countries internationally.