Complex sentence: This love of the countryside was something that united her family; indeed her brother Sir John Cripps, not only farmed at Filkins all his life, but edited "The Countryman" and was later the European Countryside Commissioner.
Split into simpler sentences: This love of the countryside was something that united her family. Her brother, Sir John Cripps, not only farmed at Filkins, but edited "The Countryman" and was later the European Countryside Commissioner.