Simplify the following text for a Grade 8 native English-speaking person.
Original: Grace also alleged that her grandmother and aunt , with Jane Southworth , attended sabbats held every Thursday and Sunday night at Red Bank , on the north shore of the River Ribble .
Simplified: Grace also said that her grandmother and aunt , with Jane Southworth , went to sabbats held every Thursday and Sunday night at Red Bank , on the north shore of the River Ribble .