Complex sentence: Chad Gilbert of Shai Hulud and later New Found Glory co-wrote and helped record every song on the album, but was not credited on the album and also kicked off Hazen Street by NFG's record label due to a contract dispute.
Split into simpler sentences: Chad Gilbert of Shai Hulud and later New Found Glory co-wrote and helped record every song on the album, but he was not credited on the album. Gilbert was dismissed from Hazen Street by New Found Glory's record label due to a contract dispute.