Complex sentence: The Guide International Service (G.I.S.) was an organisation set up by the Girl Guides Association in Britain in 1942 with the aim of sending to Europe after World War II teams of adult Girl Guides to do relief work.
Split into simpler sentences: The Guide International Service (G.I.S.) was an organisation set up by the Girl Guides Association in Britain in 1942. Their aim was to send teams of adult Girl Guides to Europe after World War II to aid with relief work.