Complex sentence: Sloan dispatches Bill with a well-aimed knife throw in his forehead, killing him and he and Vicky exit the compound along with Lando and Laurence, as the day begins to darken with thunderous sounds.
Split into simpler sentences: Sloan dispatches Bill with a well-aimed knife throw in his forehead killing him. Vicky is left standing and he and Vicky exit the compound along with Lando and Laurence, as the day begins to darken with thunderous sounds.