Original sentence: While having had a five-year career in the NHL  under his belt, it was not until moving to WHA that his scoring abilities were fully realized.in 1972 the upstart WHA came into existence and was stealing from the NHL both their superstars and players to simply fill their rosters
Edited sentence: Although having had a five-year career in the NHL  under his belt, it was not until moving to WHA that his scoring abilities were fully realized.In 1972 the WHA came into existence and the upstart league was stealing from the NHL both their superstars and players to simply fill their rosters