Complex sentence: Some of Cawthra's models were exhibited at the Royal Academy before they were placed on the memorial, which was unveiled on 15 October 1922 by Major James Burnie in the presence of a large crowd.
Split into simpler sentences: Some of Cawthra's models were exhibited at the Royal Academy before they were placed on the memorial. The memorial was unveiled on 15 October 1922 by Major James Burnie in the presence of a large crowd.