Simplify the following text for a Grade 13 native English-speaking person.
Original: On September 3 , 2008 , however , publisher Harper Collins issued a public apology for its book `` The Daring Book for Girls '' , scheduled to be published in October , which openly encouraged girls to play the instrument .
Simplified: On September 3 , 2008 , the publisher Harper Collins issued a public apology for its book `` The Daring Book for Girls '' , scheduled to be published in October , which openly encouraged girls to play the instrument .