Complex sentence: In September 2011, Hasbro introduced a third sub-line of Nerf blasters called Vortex: its blasters fire small green, bright orange or white glow-in-the-dark discs made of soft plastic covered in foam.
Split into simpler sentences: In September 2011, Hasbro introduced a third sub-line of Nerf blasters called Nerf Vortex. The line's blasters fire small green, bright orange or white glow-in-the-dark discs made of soft plastic covered in foam.