Complex sentence: It was one of the most one-sided trades in hockey history--while Sawchuk's best days had passed, Bucyk went on to play 21 more years with the Bruins and score over 500 goals en route to the Hall of Fame.
Split into simpler sentences: It was one of the most one-sided trades in hockey history. Meanwhile, Bucyk went on to play 21 more years with the Bruins and score over 500 goals en route to the Hall of Fame.