Complex sentence: Förster (1987) wrote that Moltke wanted to deter war altogether and that his calls for a preventive war diminished, peace would be preserved by the maintenance of a powerful German army instead.
Split into simpler sentences: Förster (1987) wrote that Moltke wanted to deter war altogether and that his calls for a preventive war diminished. Peace would be preserved by the maintenance of a powerful German army instead.