Complex sentence: It was conceived as a pleasure palace for the decadent 18th century libertine and Sir Francis Dashwood, the house is a long rectangle with four façades that are columned and pedimented, three theatrically so.
Split into simpler sentences: It was conceived as a pleasure palace for the 18th century libertine and Sir Francis Dashwood. The house is a long rectangle with four façades that are columned and pedimented, three theatrically so.