Complex sentence: John Walgrave Halford Fremantle, 4th Baron Cottesloe, 4th Baron Fremantle, GBE, TD (2 March 1900-1994) was Chairman of the Arts Council of Great Britain and the South Bank Theatre Board.
Split into simpler sentences: John Walgrave Halford Fremantle, 4th Baron Cottesloe, 4th Baron Fremantle, GBE, TD (2 March 1900-1994) was a British aristocrat and public official. He served as the Chairman of the Arts Council of Great Britain and the South Bank Theatre Board.