Complex sentence: His fate after this is unknown (all that is said is that "after that, he didn't remember very much"), although it is implied that he is the one accompanying Aura on planet Ararat in the prologue and epilogue of Absolution Gap.
Split into simpler sentences: His fate after this is unknown (all that is said is that "after that, he didn't remember very much"). It is implied though that he is the one accompanying Aura on planet Ararat in the prologue and epilogue of Absolution Gap.