Complex sentence: Jack, trying to rescue them, is imprisoned for vehicle theft, and rescued by the soldier'Harper' (sometime bodyguard to industrialist'Cornelius Braxton', apparent in the first book of the series).
Split into simpler sentences: Jack, trying to rescue them, is imprisoned for vehicle theft. He is rescued by the soldier Harper (sometime bodyguard to industrialist Cornelius Braxton, apparent in the first book of the series).