Complex sentence: It is the first game in the "Panzer Dragoon" series, and introduced the series' gameplay elements and, above all, its original art direction and post-apocalyptic science fantasy universe which gained critical acclaim.
Split into simpler sentences: It is the first game in the "Panzer Dragoon" series, and introduced the series' gameplay elements. In particular, its original art direction and post-apocalyptic science fantasy universe gained critical acclaim.