Original sentence: They have released 6 albums in total: Old Friends from Young Years (1997), Infest (2000), Lovehatetragedy (2002), Getting Away with Murder (2004), and The Paramour Sessions (2006), and Metamorphosis (2009)
Edited sentence: They have released six albums: Old Friends from Young Years (1997), Infest (2000), Lovehatetragedy (2002), Getting Away with Murder (2004), and The Paramour Sessions (2006), and Metamorphosis (2009)