Simplify the following text for a Grade 18 native English-speaking person.
Original: At the age of 11 , Gaga attended Convent of the Sacred Heart , a private all-girls Roman Catholic school on Manhattan 's Upper East Side , but has stressed that she does not come from a wealthy background , saying that her parents `` both came from lower-class families , so we 've worked for everything â `` my mother worked eight to eight out of the house , in telecommunications , and so did my father . ''
Simplified: At the age of 11 , Gaga started going to Convent of the Sacred Heart , a private Roman Catholic school on Manhattan 's Upper East Side , but has often said her family was n't rich , saying that her parents `` both came from lower-class families , so we 've worked for everything â `` my mother worked eight to eight out of the house , in telecommunications , and so did my father . ''