Complex sentence: After several intermediate sales, it was again purchased in 1883 by Boston publisher Daniel Lothrop and his wife, Harriett, who wrote the "Five Little Peppers" series and other children's books under the pen name Margaret Sidney.
Split into simpler sentences: After several intermediate sales, it was again purchased in 1883 by Boston publisher Daniel Lothrop and his wife, Harriett. Harriett was the author of the "Five Little Peppers" series and other children's books using the pen name Margaret Sidney.