Complex sentence: Terlouw acted as party leader from 1973--1982, was minister of Economic Affairs from 1981-1982, and was Queen's Commissioner of Gelderland from 1991-1996, the year in which he retired.
Split into simpler sentences: Terlouw acted as party leader from 1973--1982. He was minister of Economic Affairs from 1981 to 1982 and Queen's Commissioner of Gelderland from 1991 to 1996, the year in which he retired.