Simplify the following text for a Grade 10 native English-speaking person.
Original: An account of his experiences , which included being one of the first foreigners to visit Hiroshima after the atomic bomb was dropped , can be found in the book Warrior without Weapons .
Simplified: He was one of the first foreigners to visit Hiroshima after the atomic bomb was dropped , and wrote his thoughts in his book Warrior without Weapons .