Complex sentence: A few days later, however, Debra finds Dexter's knives and collection of blood slides, and asks him point blank if he is a serial killer; not knowing what else to say, Dexter replies that he is.
Split into simpler sentences: A few days later, however, Debra finds Dexter's knives and collection of blood slides, and asks him point blank if he is a serial killer. Not knowing what else to say, Dexter replies that he is.