Complex sentence: Harriett eventually wrote over 30 books; in addition to the "Five Little Peppers" series she wrote a number of books on patriotic themes, including "A Little Maid of Concord Town" and "A Little Maid of Boston".
Split into simpler sentences: Harriett eventually wrote over 30 books, not only the "Five Little Peppers" series but other books that demonstrated her love of patriotism. These include "A Little Maid of Concord Town" and "A Little Maid of Boston".