Simplify the following text for a Grade 6 native English-speaking person.
Original: FrÃ thun ( francization of Free Town ) is a commune in the Pas-de-Calais department in the Nord-Pas-de-Calais region of France .
Simplified: FrÃ thun is a commune . It is found in the region Nord-Pas-de-Calais in the Pas-de-Calais department in the north of France .