Complex sentence: Schlieffen was able to predict the railway demolitions carried out in Belgium, naming some of the ones that caused the worst delays in 1914 and his assumption that the armies could live off the land was proved correct.
Split into simpler sentences: Schlieffen was able to predict the railway demolitions carried out in Belgium, naming some of the ones that caused the worst delays in 1914. Schlieffen's assumption that the armies could live off the land was proved correct.