Complex sentence: With no one else to turn to, Poppy sneaks down to the cook's room and calls Ruby who accidentally reveals how much she dislikes Poppy and that she is seeing Poppy's boyfriend.
Split into simpler sentences: With no one else to turn to, Poppy sneaks down to the cook's room and calls Ruby. Ruby, however, accidentally reveals how much she dislikes Poppy and the fact that she is seeing Poppy's boyfriend.