Complex sentence: The Kukkiwon-or World Taekwondo Headquarters-is the traditional center for WTF taekwondo and was founded in 1973 by Dr. Kim Un Yong.
Split into simpler sentences: The Kukkiwon-or World Taekwondo Headquarters-is the traditional center for WTF taekwondo. It was founded in 1973 by Dr. Kim Un Yong.