Complex sentence: Corvo infiltrates the tower of Dunwall and removes the Lord Regent from power and, in the process, learns that the Lord Regent intentionally imported the plague to decimate the lower classes of society, though things quickly got out of hand.
Split into simpler sentences: Corvo infiltrates the tower of Dunwall and removes the Lord Regent from power. In the process, he learns that the Lord Regent intentionally brought the plague to Dunwall to decimate the lower classes, though things quickly got out of hand.