Complex sentence: Set in a zombie apocalypse setting, where a major chemical accident/secret government project turned the inhabitants of a whole city into shambling, aggressive opponents, the player must undertake various missions to rescue civilians, slaughter zombies and unlock/upgrade various cars.
Split into simpler sentences: Set in a zombie apocalypse setting, a chemical accident/secret government project has turned the inhabitants of an entire city into shambling, aggressive opponents. The player must undertake various missions to rescue stranded civilians, slaughter zombies and unlock/upgrade various cars.