Complex sentence: At Gregor's wedding, Cordelia and Aral serve as Gregor's parents, and at Aral's funeral, Gregor insists on being one of the pallbearers ("Cryoburn," Aftermaths).
Split into simpler sentences: At Gregor's wedding, Cordelia and Aral stand in place of Gregor's parents. At Aral's funeral, Gregor insists on being one of the pallbearers ("Cryoburn," Aftermaths).