Complex sentence: The Bruins were not pleased with the prospect of sharing New England with the Whalers, while the Canadiens were even less enamored with having to share the province of Quebec with the Nordiques.
Split into simpler sentences: The Bruins were not pleased with the prospect of sharing New England with the Whalers. The Canadiens were even less enamored with having to share the province of Quebec with the Nordiques.