Simplify the following text for a Grade 7 native English-speaking person.
Original: Saint-Christophe-du-Luat is a commune in the Mayenne department in north-western France .
Simplified: Saint-Christophe-du-Luat is a commune of 553 people ( 1999 ) . It is found in the region Pays de la Loire in the Mayenne department in the northwest of France .