Complex sentence: Though not his first appearance, this was the first album in which keyboard player Darren Wharton was credited as a permanent member, expanding the line-upto five and making a notable contribution as a song-writer on the opening track "Angel of Death".
Split into simpler sentences: Though not his first appearance, this was the first album in which keyboard player Darren Wharton was credited as a permanent member, becoming the fifth member of the line-up. As such, he made a contribution as a song-writer on the opening track "Angel of Death".