Complex sentence: Roman did not seek re-election to the House of Commons in 1988 but instead endorsed Micheal O'Brien as the Progressive Conservative Candidate and one of the community leaders who had convinced Roman to run as a "Coalition" independent in 1984.
Split into simpler sentences: Roman did not seek re-election to the House of Commons in 1988 but instead endorsed Micheal O'Brien as the Progressive Conservative Candidate. O'Brien was one of the community leaders who had convinced Roman to run as a "Coalition" independent in 1984.