Complex sentence: She is defined by her rivalry with Nina, a trait that has been around since the original "Tekken" game, and she originally shared most of her moves with her sister, but has since gained a more unique moveset.
Split into simpler sentences: She is defined by her rivalry with Nina, a trait that has been around since the original "Tekken" game. Anna originally shared most of her moves with her sister, but has since gained a more unique moveset.