Complex sentence: The house is one of the oldest and most historical residences in Brighton, after its immortalisation in the title novel "Ovingdean Grange" by the popular 18th century writer William Harrison Ainsworth.
Split into simpler sentences: The house is one of the oldest and most historical residences in Brighton. It is mentioned in the title of the novel "Ovingdean Grange" by the popular 18th century writer William Harrison Ainsworth.