Simplify the following text for a Grade 9 native English-speaking person.
Original: This includes the American Pit Bull Terrier , American Staffordshire Terrier , and Staffordshire Bull Terrier , and dogs with a mix of these breeds .
Simplified: James Hinks , in about 1860 , crossed the Old pit bull terrier , now known as the Staffordshire bull terrier , and produced the all-white English bull terrier .