Complex sentence: Because of this, Aisha joined the Warrior Earth Fairies to avenge her love, but she eventually returned to the Winx after they and Nebula defeat the wizards.
Split into simpler sentences: Because of this, Aisha joins the Warrior Earth Fairies to avenge her love. But she eventually comes back to the Winx after she, the Winx, and Nebula defeat the wizards.