Complex sentence: In 1946 the building became property of the state and was turned into a museum and in 1997 it was inscribed on the UNESCO World Heritage Site list, along with 13 other residences of the House of Savoy.
Split into simpler sentences: In 1946 the building became property of the state and was turned into a museum. In 1997 it was inscribed on the UNESCO World Heritage Site list, along with 13 other residences of the House of Savoy.