Simplify the following text for a Grade 3 native English-speaking person.
Original: Plante retired in 1965 but was persuaded to return to the National Hockey League to play for the expansion St. Louis Blues in 1968 .
Simplified: Plante first retired in 1965 , but he was asked to come back to the NHL to play for a new team , the St. Louis Blues , in 1968 .