sentence1: This slight 93-year-old with white hair, who is now largely confined to a wheelchair, was formally recognised last week as one of the tiny handful of people to have survived not one but both of the American atomic bombs dropped on the Japanese cities of Hiroshima and Nagasaki in August 1945 - bringing to an end to World War II. Known in Japan as one of the hibakusha - literally 'the explosion affected people' - Mr Yamaguchi had long been recognised as a survivor of the nuclear explosion in his home town of Nagasaki. But now officials there have certified formally that he also survived the Hiroshima blast three days earlier - where he'd suffered severe burns to his upper body and temporary blindness.
sentence2: Americans dropped nuclear bombs on Japan in 1945.