Complex sentence: The DLC "Napalm and Cordite" was released on July 23,2009, it contained two new maps "Suljeva Cliffside" and "Arctower Landing", in addition to the maps the Flamethrower and the Boltgun both from singleplayer made their debut in multiplayer.
Split into simpler sentences: The DLC "Napalm and Cordite" was released on July 23,2009 containing two new maps, "Suljeva Cliffside" and "Arctower Landing". In addition to the maps, the Flamethrower and the Boltgun weapons from singleplayer made their debut in multiplayer.