Complex sentence: As Walker waits for Brewster to return, an angry Chris starts slapping and pounding and slapping Walker, over his apparent disinterest in her, Chris continues to punch him, as he regards her impassively, not defending himself.
Split into simpler sentences: As Walker waits for Brewster to return, an angry Chris starts slapping and pounding Walker, over his apparent disinterest in her. As Chris continues to punch him, Walker regards her impassively, not defending himself.