Complex sentence: Alaron clears the goblins off the mountains, however when he returns to Erromon he discovers that Txomin lied, and does not know the whereabouts of Cradwagh, telling Alaron instead to travel to Talewok, and see the witch, Ardra.
Split into simpler sentences: Alaron clears the goblins off the mountains, however when he returns to Erromon he discovers that Txomin lied, and doesn't know the current whereabouts of Cradwagh. Instead, he tells Alaron to travel to Talewok, and see the witch, Ardra.