Complex sentence: In 1818 Birkbeck laid out the town of Wanborough, and Flower, whose 1500 acres adjoined Birkbeck's, laid out the town of Albion nearby.
Split into simpler sentences: In 1818 Birkbeck laid out the town of Wanborough. The same year Flower, whose 1500 acres adjoined Birkbeck's, laid out the town of Albion nearby.