Complex sentence: Prior to becoming mayor, Harvey served as Deputy Chairman of the New Zealand Film Commission from 1986 to 1992, and from 1988 to 1990 he was chairman of the 1990 Commonwealth Games Arts and Culture Festival.
Split into simpler sentences: Prior to becoming mayor, Harvey served as Deputy Chairman of the New Zealand Film Commission from 1986 to 1992. From 1988 to 1990 he was chairman of the 1990 Commonwealth Games Arts and Culture Festival.