Complex sentence: Ji-Hyun's elation is muted when she discovers an earth-shattering discovery, opening her eyes to the deception around her and making her realize that it won't be as easy to find three people who genuinely love her she once thought.
Split into simpler sentences: Ji-Hyun's elation is muted when she makes an earth-shattering discovery, opening her eyes to the deception around her. She soon realizes with painful clarity that it won't be as easy to find people who truly love her as she once thought.