Complex sentence: In August 1885 Kuss travelled to Panama, which he crossed by railway since the canal was not yet open, then via Lima to Tacna, where he evaluated a copper mine, then up to the Bolivian plateau, where he inspected a silver mine.
Split into simpler sentences: In August 1885 Küss travelled to Panama, which he crossed by railway since the canal was not yet open. Küss went on via Lima to Tacna, where he evaluated a copper mine, then up to the Bolivian plateau, where he inspected a silver mine.