Complex sentence: A further 2,000 Imperial soldiers died or were invalided at Paardeberg from illness, mostly due to drinking the water of the Modder River, downstream from where the Boer were throwing horse and cattle corpses killed by the artillery fire.
Split into simpler sentences: A further 2,000 Imperial soldiers died or were invalided at Paardeberg from illness. Mostly due to drinking the water of the Modder River, downstream from where the Boer were throwing horse and cattle corpses killed by the artillery fire.