Complex sentence: By the 1970s a backlash was underway against modernism, and Canada was one of its centres--prominent anti-modernists such as Jane Jacobs and George Baird were based in Canada.
Split into simpler sentences: By the 1970s a backlash was underway against modernism, and Canada was one of its centres. Prominent anti-modernists such as Jane Jacobs and George Baird were based in Canada.