Complex sentence: The Royal College of St. Peter in Westminster, better known as Westminster School and standing in the precincts of Westminster Abbey in London, is an independent school in England, with the highest Oxford and Cambridge acceptance rates of any secondary school or college in the world.
Split into simpler sentences: The Royal College of St Peter in Westminster, better known as Westminster School, is an independent school within in the precincts of Westminster Abbey in England. It has the highest Oxford and Cambridge acceptance rates of any secondary school or college in the world.