Complex sentence: In Australia he was private secretary to Anna Brassey and was on board the Sunbeam when she died, after her death was involved in the production of her posthumous work "The Last Voyage".
Split into simpler sentences: In Australia he was private secretary to Anna Brassey and was on board the "Sunbeam" when she died. After her death he was involved in the production of her posthumous work "The Last Voyage".