Simplify the following text for a Grade 6 native English-speaking person.
Original: The series had been canceled in September 2004 at issue eighteen , but due to high numbers of trade collection sales , Marvel revived the series in February of 2005 .
Simplified: In September 2004 , the series ended at issue # 18 . Marvel started the series again in February 2005 and it has been published ever since .