Complex sentence: After another fire in the 16th century, Giulio Romano rebuilt the interior but saved the frontage, which was replaced however in 1756--61 by the current Baroque one in Carrara marble.
Split into simpler sentences: After another fire in the 16th century, Giulio Romano remade the interior but saved the facade. The latter was however replaced in 1756--61 by the current one in the Baroque style, done in Carrara marble.