Simplify the following text for a Grade 5 native English-speaking person.
Original: The City of Dublin is the area administered by Dublin City Council , but the term `` Dublin '' normally refers to the contiguous urban area which includes parts of the adjacent local authority areas of Dun Laoghaire-Rathdown , Fingal and South Dublin . Together , the four areas form the traditional County Dublin .
Simplified: The river divides the city into two parts , North Dublin and South Dublin .