Complex sentence: It becomes apparent that the "poison" Diana injected was actually the fake-death serum 47 had used in an earlier mission and her lipstick contains the antidote for it, implying she was actually'killing' 47 for their survival.
Split into simpler sentences: It becomes apparent that the "poison" she injected was actually the fake-death serum 47 had used in an earlier mission. Diana's lipstick contains the antidote in it, implying she was actually' killing' 47 for their survival.