Complex sentence: This leads them to Cherie, the student with the hiccups, as well as the discovery that Cherie's family is wealthier than that of Kathryn; this, and the events of the assembly, cause Kathryn to seek a vendetta against Cherie.
Split into simpler sentences: This leads them to Cherie, the student with the hiccups. It is then discovered that Cherie's family is wealthier than that of Kathryn; this, and the events of the assembly, cause Kathryn to seek a vendetta against Cherie.