Simplify the following text for a Grade 8 native English-speaking person.
Original: Saint-Denis is a city and commune in the north suburbs of Paris , France . Saint-Denis is a sub-prefecture of the Seine-Saint-Denis dÃ partement , and is the seat of the Arrondissement of Saint-Denis .
Simplified: Finally , Saint-Denis is also served by two stations on Paris RER line D : Stade de France â `` Saint-Denis and Saint-Denis .