Simplify the following text for a Grade 6 native English-speaking person.
Original: Hornsby is a suburb on the Upper North Shore of Sydney , in the state of New South Wales , Australia . Hornsby is located 25 kilometres north-west of the Sydney central business district and is the administrative center of the local government area of Hornsby Shire .
Simplified: Hornsby is a suburb and shire located in the northern part of Sydney .