Complex sentence: In the Nintendo DS remake, they are an optional class obtainable through a sidequest, and have gained the ability to use black and white magic of all levels, however they cannot use other classes' new class-specific equipment.
Split into simpler sentences: In the Nintendo DS remake, they are an optional class obtainable through a sidequest and have gained the ability to use black and white magic of all levels. However, they cannot use other classes' new, class-specific equipment.