Complex sentence: However, its origin is attributed to events that began in the National Wrestling Alliance (NWA), a promotion with vari this time, WCW used the NWA World Heavyweight Championship as its world title.
Split into simpler sentences: However, its origin is attributed to events that began in the National Wrestling Alliance (NWA), a promotion with various subsidiaries. During this time, WCW used the NWA World Heavyweight Championship as its world title.