Complex sentence: Unlike all the other Maids of Honour, Lady Grace loves to climb trees in orchard when she walks the dogs, in Whitehall she mainly climbs a cherry tree that reminds her of her mother.
Split into simpler sentences: Unlike all the other Maids of Honour, Lady Grace loves to climb trees in orchards when she walks the dogs. In Whitehall she mainly climbs a cherry tree that reminds her of her mother.