Simplify the following text for a Grade 7 native English-speaking person.
Original: Abbot Suger , friend and confidante of the French Kings , Louis VI and Louis VII , decided in about 1137 , to rebuild the great Church of Saint-Denis , attached to an abbey which was also a royal residence .
Simplified: The monastery had a large church , the Abbey of Saint-Denis , and also a royal palace where the French kings sometimes stayed . Abbot Suger was a close friend to two kings , Louis VI and Louis VII .