Complex sentence: Guitar player Chris Foreman mentioned a planned box set version of the album to be released in May 2013, containing outtakes like Can't Let A Good Thing Down, 1978 and Crying.
Split into simpler sentences: Guitar player Chris Foreman mentioned a planned box set version of the album, expected to be released in May 2013. It is expected to contain outtakes like Can't Keep A Good Thing Down, 1978 and Crying.