Complex sentence: In 1872 he went to Bolivia to work in the Tocopilla Copper Mines and in 1875, moved to Iquique which was then in Peru and became involved in the production of saltpetre.
Split into simpler sentences: In 1872 he went to Bolivia to work in the Tocopilla Copper Mines. In 1875, he moved to Iquique which was then in Peru and became involved in the production of saltpetre.