Complex sentence: It is the eleventh game in the "Zork" series, the first such title not to appear under the Infocom label, and is the only game to date to feature a darker, less comical story within the Zork setting.
Split into simpler sentences: It is the eleventh game in the "Zork" series, and the first such title not to appear under the Infocom label. It features a darker, less comical story within the Zork setting.