Complex sentence: Shulo wrestled extensively on the independent circuit for various promotions in the Northeastern USA, primarily for the International Wrestling Cartel (IWC) where he won the promotion's Super Indy Championship and World Heavyweight Championship.
Split into simpler sentences: Shulo wrestled extensively on the independent circuit for various promotions in the Northeastern USA, primarily for the International Wrestling Cartel (IWC). While in the IWC, Shulo won the promotion's Super Indy Championship and World Heavyweight Championship.