Complex sentence: John Francis Michael Cannon (22 April 1930--31 March 2008) was a British botanist who held the role of Keeper of Botany at the Natural History Museum between 1978 and 1990.
Split into simpler sentences: John Francis Michael Cannon (22 April 1930--31 March 2008) was a British botanist. He was Keeper of Botany, Natural History Museum between 1978 and 1990.