Complex sentence: He subsisted solely on blood he acquired from blood banks or corpses he found and had never taken blood directly from a human being, thus he was able to survive the Montesi Formula and be restored to normal human status.
Split into simpler sentences: He subsisted solely on blood he acquired from blood banks or corpses he found and had never taken blood directly from a human being. Thus he was able to survive the Montesi Formula and be restored to normal human status.