Complex sentence: Typically, the only times Genie was at all demonstrative in her behavior were when she was upset, when she would engage in self-harming tantrums; even then her face remained expressionless, and she neither cried nor vocalized.
Split into simpler sentences: Typically, the only times Genie was at all demonstrative in her behavior were when she was upset. She never attempted to indicate the source of her anger, and would engage in self-harming tantrums; even then her face remained expressionless, and she neither cried nor vocalized.