Complex sentence: Cook's aim was to provide a systematic martial art regardless of strength or size and the Cheongye Kwan was formed by 2005 and became an offically licenced and practiced art in 2007.
Split into simpler sentences: Cook's aim was to provide a systematic martial art regardless of strength or size. The Cheongye Kwan was formed by 2005 and became a licensed and practiced art in 2007.