Complex sentence: When setting out to find a publisher for her first book, Doris Buchanan Smith was unaware that it's theme was off-limits, nor could she have guessed that "A Taste of Blackberries" would become a cherished classic.
Split into simpler sentences: When setting out to find a publisher, Doris Buchanan Smith was unaware that the theme of her first book was off-limits. Nor did she imagine that "A Taste of Blackberries" would become a cherished classic.