Complex sentence: Timothy Robin Alexander (Born 6th September 1979) is a retired Great Britain middle distance international runner who specialised in 800 metres England Senior and Great Britain Student's 800 metres distance.
Split into simpler sentences: Timothy Robin Alexander (Born 6th September 1979) is a retired Great Britain middle distance international runner who specialised in 800 metres. He has represented England Senior 800 metres and Great Britain Student's 800 metres distance.