Complex sentence: The ICRC's work to restore family links goes back to 1870 and the Franco-Prussian War, when the institution obtained lists of French prisoners held by German forces, which were used to inform families about the fate and whereabouts of the soldiers.
Split into simpler sentences: The ICRC's work to restore family links goes back to 1870 and the Franco-Prussian War. The institution obtained lists of French prisoners held by German forces, which were used to inform families about the fate and whereabouts of the soldiers.