Complex sentence: The university was originally based in an old coaching inn called the Penrhyn Arms Hotel (which housed its 58 students and 12 teaching staff), but in 1911 it moved to a much larger new building which is now the old part of the Main Arts Building.
Split into simpler sentences: The university was originally based in an old coaching inn called the Penrhyn Arms Hotel (which housed its 58 students and 12 teaching staff). In 1911 it moved to a much larger new building which is now the old part of the Main Arts Building.