Simplify the following text for a Grade 12 native English-speaking person.
Original: The years of operation only reflect the time in which that team was in the NHL ; it does not take into account any time in which the franchise operated in another league ( such as the World Hockey Association or the National Hockey Association ) .
Simplified: The years of operation only reflect the time in which that team was in the NHL ; it does not take into account any time in which the franchise operated in another league ( such as the World Hockey Association ) .