Complex sentence: Claudia gloats, clutching her newly revived, not fully formed baby boy; disappears; then reappears to attack Lilli, smashing her into mirrors and deliberately cutting her face with one of the shards.
Split into simpler sentences: Claudia gloats, clutching her newly revived, not fully formed baby boy. She disappears then reappears to attack Lilli, smashing her into mirrors and deliberately cutting her face with one of the shards.