Complex sentence: January 1985-December 1989 were spent as Consultant at the Medical School, UCT and since 1991 he has been an Honorary Lecturer at the Medical Faculty of the University of Cape Town.
Split into simpler sentences: January 1985-December 1989 were spent as Consultant at Medical School, UCT. Since 1991 he has been an Honorary Lecturer at the Medical Faculty of the University of Cape Town.