Complex sentence: Along comes the sexually adventurous Mona Mayfair, a thirteen-year-old witch more powerful than Rowan with more lines of descent from Suzanne than anyone else in the family.
Split into simpler sentences: Along comes the sexually adventurous Mona Mayfair, a thirteen-year-old, whose powers rival that of Rowan. Mona has more lines of descent from Suzanne than anyone else in the family.