Simplify the following text for a Grade 10 native English-speaking person.
Original: The film began production in early 2007 and was released on July 16 , 2008 in Australia and July 18 , 2008 in the United States , to overwhelming critical acclaim with some critics calling it the greatest comic-book based movie ever made .
Simplified: The film began production in early 2007 and was released on July 18 2008 in the United States , to overwhelming critical acclaim .