Complex sentence: After leaving Canberra, Furner moved to the English Super League where he played for the Wigan Warriors, with whom he won the Challenge Cup and the Leeds Rhinos, with whom he won the Super League Grand Final.
Split into simpler sentences: After leaving Canberra, Furner moved to England's Super League where he played for the Wigan Warriors. After that he joined the Leeds Rhinos, with whom he won the Super League Grand Final.