Complex sentence: She is named DotNM by Egeanin causing Mat to speak aloud that she is his wife, which in turn cause Tuon to smile and being left with no options Mat kidnaps her and her servant Selucia.
Split into simpler sentences: She is named DotNM by Egeanin causing Mat to announce that she is his wife, which in turn cause Tuon to smile. Left with no options, Mat kidnaps her and her servant Selucia.