Complex sentence: The Liberals were swept out of office in 1958 by the Manitoba Progressive Conservatives of Dufferin Roblin who, as Red Tories were actually to the left of Campbell's Liberals.
Split into simpler sentences: The Liberals were swept out of office in 1958 by the Manitoba Progressive Conservatives of Dufferin Roblin. Dominated by Red Tories, this party was actually to the left of Campbell's Liberals.