Complex sentence: In a note written for Bruce that Rachel leaves with Alfred hours before the kidnapping, she reveals that while she loves both Bruce and Dent, she has chosen Dent because she is now sure Bruce won't be able to give up being Batman.
Split into simpler sentences: In a note written for Bruce that Rachel leaves with Alfred hours before the kidnapping, she reveals that while she cares both Bruce and Dent. And knows now for sure Bruce won't be able to give up being Batman.