Complex sentence: Ikethsti arrives again to tell a cryptic message saying the whole plot was really an elaborate set up, as Cirae-Argoth was not her real master and Grondoval's kindred has never disappeared, as it was actually only him who has vanished.
Split into simpler sentences: Ikethsti arrives again to tell a cryptic message, saying the whole plot was really an elaborate set up. As Cirae-Argoth was not her real master and Grondoval's kindred has never disappeared, it was actually only Grondoval who has vanished.