Complex sentence: Imagire arrived in 1947 and was given an address where Alexander had left her printed materials and found the only building still standing after the bombing still held two hundred copies of "Bahá'u'lláh and the New Era" in Japanese.
Split into simpler sentences: Imagire arrived in 1947 and was given an address where Alexander had left her printed materials. He found the only building still standing after the bombing held 200 copies of "Bahá'u'lláh and the New Era" in Japanese.