Complex sentence: At the outset of WWI, she took up residence in London, near the Australian Army Headquarters and the Anzac Buffet, Mrs Wheeler endeavoured to contact all soldiers from central Queensland, whether they were wounded, imprisoned, or in the trenches.
Split into simpler sentences: At the outset of World War I, she took up residence in London, near the Australian Army Headquarters and the Anzac Buffet. From this base, Mrs Wheeler endeavoured to contact all soldiers from central Queensland, whether they were wounded, imprisoned, or in the trenches.