Complex sentence: Old Scona Academic has been recognized as one of the best high schools in Canada and one of the top I.B. schools in the world when in 2005, Maclean's Magazine named OSA as the top academic high school in Canada.
Split into simpler sentences: Old Scona Academic has been recognized as one of the best high schools in Canada and one of the top I.B. schools in the world. In 2005, Maclean's Magazine named OSA as the top academic high school in Canada.