Complex sentence: Lena plays a sneaky role during the event, helping Luthor and his allies beat Imperiex by feeding her father information while secretly manipulating events to benefit Brainiac 13, although she is convinced at the end to side with her father.
Split into simpler sentences: Lena plays a sneaky role during the event, helping Luthor and his allies beat Imperiex by feeding her father information, while secretly manipulating events to benefit Brainiac 13. She is ultimately convinced at the end to side with her father.