Complex sentence: Burke St John Trend, Baron Trend, GCB, CVO, PC (1914--21 July 1987) was a British civil servant, becoming Cabinet Secretary under both Harold Wilson and Ted Heath between 1963 to 1973.
Split into simpler sentences: Burke St John Trend, Baron Trend, GCB, CVO, PC (1914--21 July 1987) was a British civil servant. Trend became Cabinet Secretary under both Harold Wilson and Ted Heath between 1963 to 1973.