Complex sentence: The fallen knight perished with his honor restored, vowing that he would forever search for the elf maid and his son in the afterlife, and in that search, he would be redeemed.
Split into simpler sentences: The fallen knight perished with a measure of his honor restored, vowing that he would forever search for the elf maid and his son in the afterlife. He hoped, in that search, he would be redeemed.