Complex sentence: He served on Peterborough City Council from 1969 to 1972, from 1974 to 1982, and from 1985 to 1997, at which time he was acclaimed to a seat on the Peterborough Utilities Commission.
Split into simpler sentences: He served on Peterborough City Council from 1969 to 1972, from 1974 to 1982, and from 1985 to 1997. In 1997, he was acclaimed to a seat on the Peterborough Utilities Commission.