Complex sentence: The trigger is composed of two interdependent parts, and the shooter in firing the weapon manipulates both parts of the trigger, where unintentional pressure or a strike against the trigger is unlikely to do so, and such an action will not fire the weapon.
Split into simpler sentences: The trigger is composed of two interdependent parts, and the shooter in firing the weapon manipulates both parts of the trigger. Conversely, unintentional pressure or a strike against the trigger is unlikely to do so, and such an action will not fire the weapon.