Complex sentence: Meanwhile, Shadow and his fellow agent Rouge accidentally release an evil spirit, Mephiles, who transports them to a post-apocalyptic future ravaged by a devilish monster, Iblis.
Split into simpler sentences: Meanwhile, Shadow and his fellow agent Rouge accidentally release an evil spirit, Mephiles. The spirit transports them to a post-apocalyptic future ravaged by a devilish monster, Iblis.