Complex sentence: It is the first game in the "Baldur's Gate" series, and takes place in the Forgotten Realms, a high fantasy campaign setting, using a modified version of the "Advanced Dungeons & Dragons" ("AD&D") 2nd edition rules.
Split into simpler sentences: It is the first game in the "Baldur's Gate" series. The game takes place in the Forgotten Realms, a high fantasy campaign setting, using a modified version of the "Advanced Dungeons & Dragons" ("AD&D") 2nd edition rules.