Complex sentence: If Leo still loves her, She vows to return to Africa, to make them both immortal, and rule the world together, but first they must wait for the change of seasons and the weather to clear, before they can travel.
Split into simpler sentences: If Leo still loves her, She vows to return to Africa, to make them both immortal, and rule the world together. But, first they must wait for the change of seasons and the weather to clear, before they can travel.