Complex sentence: The area was excavated by Sir Mortimer Wheeler in 1932, and according to a plaque at one entrance to the dyke, presented by Lord Brocket in 1937 on the occasion of the coronation of King George VI.
Split into simpler sentences: The area was excavated by Sir Mortimer Wheeler in 1932. According to a plaque at one entrance to the dyke, the land was presented by Lord Brocket in 1937 on the occasion of the coronation of King George VI.