Complex sentence: Its architecture is very original--it is a merger of European art with Old-Polish building tradition and its elevation and palace interiors that, using antique symbols, glorifies the Sobieski family, especially military triumphs of the king.
Split into simpler sentences: Its architecture is very original: it is a merger of European art with old Polish building tradition. In its elevation and palace interiors antique symbols glorify the Sobieski family, especially the military triumphs of the king.