Original: He set down his experiences in Kriegsgefangen Erlebtes 1870 (1871) and published his observations on the campaign in Der Krieg gegen Frankreich 1870-71 (1874-1876).
Simplified: His experiences there are set down in Kriegsgefangen Erlebtes 1870 (1871); subsequently he published his observations on the campaign in Der Krieg gegen Frankreich 1870-71 (1874-1876).