Complex sentence: Excavation started in 1987, and officially opened in the Spring of 1989.The mall opened in 1989 and was owned and managed by Cadillac Fairview until it was purchased by the Ontario Pension Board in 2010 for $370 million (CAD).
Split into simpler sentences: Excavation started in 1987, and officially opened in the Spring of 1989. When the mall opened in 1989 and was owned and managed by Cadillac Fairview until it was purchased by the Ontario Pension Board in 2010 for $370 million (CAD).