Complex sentence: The original Zoology Museum established by Thompson at Dundee became neglected after his move to St. Andrews and in 1956 the building it was housed in was scheduled for demolition and the museum collection was dispersed, with some parts going to the British Museum.
Split into simpler sentences: The original Zoology Museum established by Thompson at Dundee became neglected after his move to St. Andrews. In 1956 the building, which it was housed in, was scheduled for demolition and the museum collection was dispersed, with some parts going to the British Museum.