Complex sentence: Typically, the first round is manually loaded into the chamber by pulling back and releasing ("racking") the slide mechanism, after which the recoil operation of the handgun when fired automatically extracts, ejects, and reloads the chamber.
Split into simpler sentences: Typically, the first round is manually loaded into the chamber by pulling back and releasing ("racking") the slide mechanism. After the trigger is pulled and the round is fired, the recoil operation of the handgun automatically extracts, ejects, and reloads the chamber.