Complex sentence: Mallory, feigning to reciprocate at first, rebuffs his efforts, smashing his face against the wall and breaking his nose, before two guards subdue her, and Scagnetti sprays her face with tear gas in revenge.
Split into simpler sentences: Mallory, feigning to reciprocate at first, rebuffs his efforts, smashing his face against the wall and breaking his nose. Finally, the two guards subdue her, and Scagnetti sprays her face with tear gas in revenge.