Complex sentence: Also siding with Volef is the Raimun, an alchemist and samurai, both of whom had received their powers from a mysterious source which turns out to be the dragon pursued by Clovis.
Split into simpler sentences: Also siding with Volef is the alchemist and samurai, Raimun. Both had received their powers from a mysterious source which turns out to be the dragon purused by Clovis.