Original sentence: While having had a five-year career in the NHL under his belt 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