Simplify the following text for a Grade 6 native English-speaking person.
Original: It is the joint seat of the Diocese of Tarbes-et-Lourdes and is the largest pilgrimage site in France , the second site being the Basilica of St. ThÃ rÃ se ( Lisieux ) , in Normandie .
Simplified: It is the joint seat of the diocese of Tarbes-et-Lourdes .