Complex sentence: In addition, he purchased Hengistbury Head, a mile-long promontory on England's southern coast, where he planned to build a magnificent castle; the land was put up for sale in 1930.
Split into simpler sentences: In addition, he purchased Hengistbury Head, a mile-long promontory on England's southern coast, where he planned to build a magnificent castle. The land was put up for sale in 1930.