Simplify the following text for a Grade 7 native English-speaking person.
Original: According to Rowling , the idea for both the Harry Potter books and its eponymous protagonist came while waiting for a delayed train from Manchester to London in 1990 .
Simplified: According to author J. K. Rowling , the idea for both the Harry Potter books and the character came while waiting for a delayed train from Manchester to London in 1990 .