Complex sentence: According to "Highs-Ghoul Confidential", Ginger and Jacques attended the same high school as Beetlejuice, and went to the school prom together; and Ginger was on the school cheerleading squad and had magenta-colored hair in a fifties hairdo.
Split into simpler sentences: According to "Highs-Ghoul Confidential", Ginger and Jacques attended the same high school as Beetlejuice and went to the school prom together. During that time, Ginger was on the school cheerleading squad and had magenta-colored hair in a fifties hairdo.