Complex sentence: He has served as chair of the Royal Commission on Planning and Development Reform in Ontario from 1991 to 1993, an advisor to East London, South Africa's city council from 1994 to 1999 and as advisor on the re-establishment of local government in Malawi in 2000.
Split into simpler sentences: He has served as chair of the Royal Commission on Planning and Development Reform in Ontario from 1991 to 1993. Sewell was an advisor to East London, South Africa's city council from 1994 to 1999 and as advisor on the re-establishment of local government in Malawi in 2000.