Complex sentence: During World War II, Sitwell returned from France and retired to Renishaw with her brother Osbert and his lover David Horner and wrote under the light of oil lamps when the lights of England were out of service.
Split into simpler sentences: During World War II, Sitwell returned from France and retired to Renishaw with her brother Osbert and his lover David Horner. She wrote under the light of oil lamps when the lights of England were out of service.