Complex sentence: Barnum returns home to find his circus on fire, a result of a fight between protesters and the troupe's performers--in the chaos, Carlyle believes Wheeler to be stuck in the burning building and impulsively races in to rescue her.
Split into simpler sentences: Barnum returns home to find his circus on fire, a result of a fight between protesters and the troupe's performers. In the chaos, Carlyle believes Wheeler to be stuck in the burning building and impulsively races in to rescue her.