Simplify the following text for a Grade 9 native English-speaking person.
Original: It is the brother school of the City of London School for Girls ( a girls ' school within the City ) and the co-educational City of London Freemen 's School ( a day and boarding school in Surrey ) .
Simplified: It is the brother school of the City of London School for Girls ( a girls ' school within the City ) and of the City of London Freemen 's School ( a day and boarding school in Surrey ) .