Simplify the following text for a Grade 6 native English-speaking person.
Original: As Lear explains , Potter titled the The Tale of Peter Rabbit and Mr. McGregor 's Garden and sent it to publishers , but `` her manuscript was returned ... including Frederick Warne & Co. ... who nearly a decade earlier had shown some interest in her artwork .
Simplified: Potter 's manuscript book had the title of The Tale of Peter Rabbit and Mr. McGregor 's Garden . The manuscript was refused by six publishers .