Complex sentence: In 1997 Jean Chretien appointed him to Cabinet as Secretary of State (International Financial Institutions) but Peterson was sent back to the backbench in 2002 but returned to serve in the cabinet of Paul Martin whom Peterson had long supported.
Split into simpler sentences: In 1997 Jean Chretien appointed him to the Ministry as Secretary of State (International Financial Institutions), but Peterson was sent back to the backbench in 2002. He returned to serve in the cabinet of Paul Martin whom Peterson had long supported.