Complex sentence: Ma Bufang's headquarters was converted into the provincial museum by the Communists, until a new one was built, it currently contains the "Qinghai Cultural Relics and Archaeology Institute" collection.
Split into simpler sentences: Ma Bufang's headquarters was converted into the provincial museum by the Communists, until a new one was built. It currently contains the "Qinghai Cultural Relics and Archaeology Institute" collection.