Complex sentence: He had a further three articles about it published in "North American Review" between December 1902 and February 1903, then published the articles as a book, "Christian Science" (1907).
Split into simpler sentences: He had a further three articles about it published in "North American Review" in December 1902, and January and February 1903. He collected the articles and published them as a book, "Christian Science" (1907).