Complex sentence: A later 1960 portrait by Dargie and a 1945 one by Nora Heysen are held by the Australian War Memorial, but are not on display, although they can be viewed online.
Split into simpler sentences: A later 1960 portrait by Dargie, together with a 1945 one by Nora Heysen, is in the Australian War Memorial. Neither is on display, although they can be viewed online.