Complex sentence: Helsinki University Museum'Arppeanum' is the museum of the University of Helsinki that was located until June 2014 on Snellmanninkatu off the north-east corner of Senate Square.
Split into simpler sentences: Helsinki University Museum is the museum of the University of Helsinki. The museum was located until June 2014 in a building called Arppeanum on Snellmanninkatu off the north-east corner of Senate Square.