Complex sentence: In 1840 a now demolished hotel extension was added to the northern side of the building, the hotel closed when Queen's Hotel was opened next to New Street station, and the building was latterly used as railway offices.
Split into simpler sentences: In 1840 a now demolished hotel extension was added to the northern side of the building. The hotel closed when Queen's Hotel was opened next to New Street station, and the building was latterly used as railway offices.