Complex sentence: Ouellet represented the safe Liberal seat of Papineau in Montreal for almost thirty years and even when the Liberals were crushed by the Tories in the election of 1984 he retained his seat by a substantial margin.
Split into simpler sentences: Ouellet represented the safe Liberal seat of Papineau in Montreal for almost thirty years. Even when the Liberals were crushed by the Progressive Conservative Party in the election of 1984, he retained his seat by a substantial margin.