Complex sentence: While Chelios sleeps in his apartment, Verona breaks in and injects Chelios with the "Beijing Cocktail", a synthetic drug inhibiting the flow of adrenalin, slowing the heart and eventually killing the victim.
Split into simpler sentences: While Chelios sleeps in his apartment, Verona breaks in and injects Chelios with the "Beijing Cocktail". A synthetic drug inhibiting the flow of adrenalin: slowing the heart, and eventually killing the victim.