Complex sentence: She thinks of how Cal drove her all the way to the airport and didn't even mention Kitty's death or that they were now free to live together: he wants to start a new life and she is not part of his plans.
Split into simpler sentences: She thinks of how Cal drove her all the way to the airport and didn't even mention Kitty's death or that they were now free to live together. She sees that he wants to start a new life and she is not part of his plans.