The house's famous Long Gallery has Pompeian fresco inspired designs and Venetian chandeliers; the great staircase is the work of Simon Vierpyl; and the plasterwork is by the Francinis.
The Francinis created the house's great staircase and Simon Vierply was responsible for the plasterwork. 
mnli hypothesis: The Francinis created the house's great staircase and Simon Vierply was responsible for the plasterwork.  premise: The house's famous Long Gallery has Pompeian fresco inspired designs and Venetian chandeliers; the great staircase is the work of Simon Vierpyl; and the plasterwork is by the Francinis.