Complex sentence: Quenthel, third daughter of Yvonnel Baenre, High Priestess of Lolth, second only to Matron Mother Triel Baenre as Menzoberranzan's most powerful priestess, rose through the ranks as High Priestess quickly with Lolth's favor.
Split into simpler sentences: Quenthel, third daughter of Yvonnel Baenre, High Priestess of Lolth, second only to Matron Mother Triel Baenre as Menzoberranzan's most powerful priestess. Rose through the ranks as High Priestess quickly with Lolth's favor.