Complex sentence: Across the valley is a neighbour's house where authors stay to work on their stories, but the husband, Nicholas, a prolific crime novelist, keeps having affairs while his wife stays at home providing food and lodging for her patrons.
Split into simpler sentences: Across the valley is a neighbour's home where authors retreat to work on their stories. The owner, Nicholas, is a prolific crime novelist and a serial philanderer, having affairs while his wife stays at home providing food and lodging for her patrons.