Complex sentence: Süssmilch discovered that, on the long run, there is a constant sex ratio of 1,000 female births to 1,050 male births, which he saw as a proof of the Divine working in this World.
Split into simpler sentences: Süssmilch discovered that, in the long term, there is a constant sex ratio of 1,000 female births to 1,050 male births. He saw this as a proof of the Divine working in this World.