Complex sentence: As an Anointed One, Ella is immortal until she fulfills her destiny and can harness the power of lightning to kill herself, cross the realm of the dead, and be reborn.
Split into simpler sentences: As an Anointed One, Ella is immortal until she fulfills her destiny. Further, as an Anointed one, Ella can harness the power of lightning to kill herself, pass through the realm of the dead, and be reborn.