Simplify the following text for a Grade 7 native English-speaking person.
Original: The Fox and the Hound is a 1981 animated movie produced by Walt Disney Productions , first released to movie theaters in the United States on July 10 , 1981 .
Simplified: The Fox and the Hound is a 1981 animated feature loosely based on the Daniel P. Mannix novel of the same name , produced by Walt Disney Productions and released in the United States on July 10 , 1981 .