Complex sentence: Matt talks to his wife about the last couple of "great" days that they had together, he wants to say more about their issues, but "overhears" her thoughts that "he knows" something that she hasn't shared.
Split into simpler sentences: Matt talks to his wife about the last couple of "great" days that they had together. Wanting to say more about their issues, he "overhears" her thoughts that "he knows" something that she hasn't shared.