Complex sentence: The IGA operations in Atlantic Canada were sold to Loblaw Companies Limited except for Edmundston, New Brunswick and were restructured under its existing brands, while its company-owned stores west of Quebec now mainly operate under the Sobeys banner.
Split into simpler sentences: The IGA operations in Atlantic Canada were sold to Loblaw Companies Limited (except for Edmundston, New Brunswick) and were restructured under its existing brands. The company-owned stores west of Quebec now mainly operate under the Sobeys banner.