Complex sentence: However, the Hearts of each world cannot be taken by force; they must be given willingly, which is why Nerissa had to resort to trickery to acquire Elyon's powers instead of direct confrontation or stealing it from her.
Split into simpler sentences: However, the Hearts of each world cannot be taken by force. They must be given willingly, which is why Nerissa had to resort to trickery to acquire Elyon's powers instead of direct confrontation or stealing it from her.