Complex sentence: Now aware of humanity's determination to depose him, Superman decides to destroy Gotham and Metropolis to demonstrate the chaos that would arise in his absence and murders Shazam when the latter protests, causing Flash to defect and fight his way to the insurgency.
Split into simpler sentences: Now aware of humanity's determination to depose him, Superman decides to destroy Gotham and Metropolis to demonstrate the chaos that would arise in his absence. He murders Shazam when the latter protests, causing Flash to defect and fight his way to the insurgency.