Complex sentence: His day job has always been in teaching physical education and for the last 20 years he has been Director of that subject at Harrow School, where in 2008 he retired to look after his wife and was succeeded by Jesse Coulson.
Split into simpler sentences: His day job has always been in teaching physical education and for the last 20 years he has been Director of that subject at Harrow School. Where in 2008 he retired to look after his wife and was succeeded by Jesse Coulson.