In view of the debacle in posting the wrong ciphertext for http://www.experts-exchange.com/Other/Puzzles_Riddles/Q_22424196.html
I have awarded points for the efforts to date and closed the question. I am offering a fresh set of points for breaking the code here.
The message is: (Underscores represent spaces)
The message should be 251 characters long. Just to review the clues so far; this is a double transposition cipher, its keys are 6 and 9 characters long and the message contains the text "has been keeping us entertained".