Complex sentence: Berkeley Castle (historically sometimes spelled "Berkley Castle") is a castle in the town of Berkeley, Gloucestershire, UK, constructed from 1117 A.D., on the orders of Henry II, with the aim of defending the Severn estuary and the Welsh border.
Split into simpler sentences: Berkeley Castle (historically sometimes spelled "Berkley Castle") is a castle in the town of Berkeley, Gloucestershire, UK. It was constructed from 1117 A.D., on the orders of Henry II, with the aim of defending the Severn estuary and the Welsh border.