Complex sentence: He understood this article to be a denial that man is duty bound to believe "each individual is himself" included in the redemption work of Christ and he affirmed that man is "inexcusable in his unbelief" against God's revealed word and works.
Split into simpler sentences: He understood this article to be a denial that man is duty bound to believe "each individual is himself" included in the redemption work of Christ. He affirmed that man is "inexcusable in his unbelief" against God's revealed word and works.