Complex sentence: At school, Chuck tries to threaten her about exposing their tryst to Nate, to which Blair replies that he would never tell Nate since that would ruin their friendship, and that she no longer wants to be a part of his games.
Split into simpler sentences: At school, Chuck tries to threaten her about exposing their previous tryst to Nate. To which Blair replies that he would never tell Nate since that would ruin their friendship, and that she no longer wants to be a part of his games.