Complex sentence: It appeared for the last time in February 1987 following which Michael Wynne-Parker retired, to be replaced by Kenneth McLennan Hay, BEM who served a two-year term as Secretary-General.
Split into simpler sentences: It appeared for the last time in February 1987 following which Michael Wynne-Parker retired. He was replaced by Kenneth McLennan Hay, BEM who served a two-year term as Secretary-General.