Simplify the following text for a Grade 12 native English-speaking person.
Original: The Patrick Division , which had heretofore been in the Clarence Campbell Conference , switched to the Prince of Wales Conference , while the Norris Division went the other way , going from the Wales Conference to the Campbell Conference .
Simplified: The Patrick Division , which had been in the Clarence Campbell Conference , switched to the Prince of Wales Conference , while the Norris Division went the other way , going from the Wales Conference to the Campbell Conference .