Complex sentence: The album's working title was "The Darkest Day of Man" being named after a song on the album, but since this change "A New Era of Corruption" marks the first Whitechapel album that does not feature a title track.
Split into simpler sentences: The album's working title was "The Darkest Day of Man", being named after a song on the album. This change makes "A New Era of Corruption" the first Whitechapel album that does not have a title track.