Simplify the following text for a Grade 7 native English-speaking person.
Original: She studied at Augsburg University before making her debut in Aachen as the priestess in Verdi 's Aida in 1940 .
Simplified: She studied at Augsburg University . Her first appearance in opera was in Aachen where she sang the role of the priestess in Verdi 's Aida in 1940 .