Complex sentence: At Los Alamos he headed F Division, where he worked on the thermonuclear "Super", and was present at the Trinity test on 16 July 1945, where he used one of his igneous Fermi method experiments to estimate the bomb's yield.
Split into simpler sentences: At Los Alamos he headed F Division, where he worked on the thermonuclear "Super". He was present at the Trinity test on 16 July 1945, where he used one of his igneous Fermi method experiments to estimate the bomb's yield.