Simplify the following text for a Grade 5 native English-speaking person.
Original: She was the 4th woman to be principal for the famous school : Anne Marie Milan Desguillons had been the first in 1793-1800 , but she was principal jointly with her spouse .
Simplified: She was the third woman to be principal for the famous school . Anne Marie Milan Desguillons had ben the first in 1793-1800 , but she was principal together with her husband .