Complex sentence: Thus She is the most important consort of Krishna, His heart and soul, and His hladini-shakti (spiritula pleasure potency), just as the shakti of Shiva is Parvati or the shakti of Narayana is Lakshmi.
Split into simpler sentences: Thus She is the most important consort of Krishna, His heart and soul, and His hladini-shakti (spiritula pleasure potency). Similarly, the shakti of Shiva is Parvati or the shakti of Narayana is Lakshmi.