Complex sentence: Corning would be re-elected by major landslides for the rest of his career, except in 1973 when a prominent businessman, Carl Touhey, ran a well-financed campaign and came within 3,200 votes of unseating the powerful mayor.
Split into simpler sentences: Corning would be re-elected by major landslides for the rest of his career. The most notable exception was 1973 when a prominent businessman, Carl Touhey, ran a well-financed campaign and came within 3,200 votes of unseating the powerful mayor.