Complex sentence: According to "Highs-Ghoul Confidential", Jacques and Ginger attended the same high school as Beetlejuice, and went to the school prom together; and Jacques was on the school train track team and had an overbite.
Split into simpler sentences: According to "Highs-Ghoul Confidential", Jacques and Ginger attended the same high school as Beetlejuice and went to the school prom together. During that time, Jacques was on the school train track team and had an overbite.