Simplify the following text for a Grade 9 native English-speaking person.
Original: In 1981 , the NHL changed the format of awarding the trophy , instead giving it to the goaltender deemed best in the league based on a poll of NHL general managers .
Simplified: In 1981 , the NHL changed the format of awarding the trophy , giving it to the goaltender deemed best in the league , chosen by NHL general managers .