Complex sentence: A pair of unique crystal chandeliers, called the "Sans Souci", donated by the David Sassoon family, which was earlier located in the Sassoon mansion, was shifted to the foyer of the opera house.
Split into simpler sentences: A pair of unique crystal chandeliers, called the "Sans Souci" were donated by the David Sassoon family. The chandeliers, which were earlier located in the Sassoon mansion, were shifted to the foyer of the opera house.