Simplify the following text for a Grade 8 native English-speaking person.
Original: It was first released for the PlayStation 2 in November 2006 and then for the Xbox 360 in April 2007 , with additional content not originally in the PlayStation 2 version .
Simplified: Guitar Hero II is a music video game , released for the PlayStation 2 on November 7 , 2006 and the Xbox 360 on April 3 , 2007 .