Complex sentence: The models and a growing collection of other artifacts became a museum, housed in a ward of the original "State Lunatic Asylum No.2" before it was moved to a larger, more modern complex of buildings.
Split into simpler sentences: The models and a growing collection of other artifacts became a museum. At first it ws housed in a ward of the original "State Lunatic Asylum No.2"; later it was moved to a larger, more modern complex of buildings.