Complex sentence: At the end of "Conclusions", it is revealed Avenir is Josie's father, having, years ago, (regretfully) deceived Kelly to work against Victor, though inevitably she turned against Avenir, but not before the two conceived Josie.
Split into simpler sentences: At the end of "Conclusions", it is revealed Avenir is Josie's father, having, years ago, (regretfully) deceived Kelly into working against Victor. She eventually turned against Avenir, but not before the two conceived Josie.