Complex sentence: She describes the mind of a serial killer as flying through life with large blind spots and missing pieces of what it means to be human, and claims that these people are untreatable because they are missing the parts that need treatment.
Split into simpler sentences: She describes the mind of a serial killer as flying through life with large blind spots and missing pieces of what it means to be human. And that these people are untreatable, because they are missing the parts that need treatment.