Simplify the following text for a Grade 6 native English-speaking person.
Original: Majesco has also released two other Nancy Drew games for the DS , entitled Nancy Drew : The Mystery of the Clue Bender Society ( released July 2008 ) and Nancy Drew : The Hidden Staircase , based on the second book in the original Nancy Drew Mystery Stories series ( released September 2008 ) .
Simplified: Nancy Drew is a fictional character . She is the main character in a series of chapter books called Nancy Drew Mystery Stories .