Simplify the following text for a Grade 5 native English-speaking person.
Original: It was adapted into a film named Percy Jackson and the Olympians : The Lightning Thief which was released in the United States on February 12 , 2010 .
Simplified: It was made into a film named Percy Jackson and the Olympians : The Lightning Thief . The film was first shown in the United States on February 12 , 2010 .