Complex sentence: It can only be assumed that she sought somehow to ennoble the name to achieve a better volume of sales-she even went to the extremes of scratching "de" into Pearsall's signature on some of his letters, to attempt to justify herself.
Split into simpler sentences: It can only be assumed that she sought somehow to ennoble the name to achieve a better volume of sales. She even went to the extremes of scratching "de" into Pearsall's signature on some of his letters, to attempt to justify herself.