Complex sentence: D'Amour sees she has lost all grip on reality, and after asking her about Swann she loses control and tells D'Amour that she's afraid of Nix and that he is called The Puritan.
Split into simpler sentences: D'Amour sees she has lost all grip on reality. After asking her about Swann she loses control and tells D'Amour that she's afraid of Nix and that he is the one that is called The Puritan.