Original sentence: While having had a five-year career in the NHL  under his belt he had been used in predominatly a defensive role, shadowing the other teams offensive stars, and it was not until Danny Lawson jumped to the upstart WHA in 1971 that his scoring abilities were fully realized
Edited sentence: While having had a five-year career in the NHL  under his belt he had been used in predominatly a defensive role, shadowing the other teams' offensive stars, and it was not until Danny Lawson jumped to the upstart WHA in 1971 that his scoring abilities were fully realized