Simplify the following text for a Grade 6 native English-speaking person.
Original: Rognes is a commune in the Bouches-du-Rh Ã ne department in southern France .
Simplified: Rognes is a commune of 4,194 people ( 1999 ) . It is found in the region Provence-Alpes-C Ã te d'Azur in the Bouches-du-Rh Ã ne department in the south of France .