Complex sentence: Luo was eighteen and Mao just fourteen years old at the time of their betrothal; although Mao went through with the wedding ceremony, he was unhappy with the marriage, never consummating it and refusing to live with his wife.
Split into simpler sentences: Luo was eighteen and Mao just fourteen years old at the time of their betrothal. Although Mao took part in the wedding ceremony, he was unhappy with the marriage, never consummating it and refusing to live with his wife.