Complex sentence: Roy and Lilina become the new marquesses of Pherae and Ostia, while Idenn is taken to Arcadia and lives with Fae as her soul slowly returns to her.
Split into simpler sentences: Roy and Lilina become the new marquesses of Pherae and Ostia. As to Idenn, she is taken to Arcadia and lives with Fae as her soul slowly returns to her.