Complex sentence: Her latest work is in theme and insert songs from Sousei no Aquarion anime, while most songs were sing by Arai Akino and also one song Tori ni natte (Change into birds), which is sung by Aoi.
Split into simpler sentences: Her latest work is in theme and insert songs from Sousei no Aquarion anime. Most of her songs were sung by Arai Akino; one song "Tori ni natte" (Change into birds) was sung by Aoi.