Complex sentence: After his return from America, Nordenskjöld occupied himself with mineralogical studies, but his health started to deteriorate again in 1894 and he died on June 6,1895, aboard a train traveling to Jämtland, only 27 years old.
Split into simpler sentences: After his return from America, Nordenskjöld occupied himself with mineralogical studies, but his health started to deteriorate again in 1894. He died on June 6,1895, aboard a train traveling to Jämtland, only 27 years old.