Complex sentence: Thoroughgood manages to locate one such location near his childhood home in Beaconsfield, and at the conclusion of the book another cache is found in Southwold, near Sizewell nuclear power stations.
Split into simpler sentences: Thoroughgood manages to locate one such cache near his childhood home in Beaconsfield. At the conclusion of the book another cache is found in Southwold, near the Sizewell nuclear power stations.