Complex sentence: The largest room in Bright's Building is Ramsay Hall, named after Allen Benville Ramsay, originally a lecture room but refurbished in 1949 to become the college's canteen.
Split into simpler sentences: The largest room in Bright's Building is Ramsay Hall, named after Allen Benville Ramsay. The room was originally intended to be a lecture room, but it was later refurbished in 1949 to become the college's canteen.