Complex sentence: After the castaways found a refuge on Elephant Island, McIlroy was the surgeon performing the amputation of Perce Blackborow's gangrenous toes, with Macklin serving as anestheologist, carefully administering a tiny quantity of salvaged chloroform as anaesthesia.
Split into simpler sentences: After the castaways found a refuge on Elephant Island, McIlroy was the surgeon for the amputation of Perce Blackborow's gangrenous toes. McIlroy's colleague Macklin served as anestheologist, carefully administering a tiny quantity of salvaged chloroform as anaesthesia.