Input (grade 13): There were three new sections introduced, first was a sponsored partwork the initial one to be a cookery book; then a colour comic supplement (an innovation in the British Sunday newspaper market); and lastly, a magazine - You magazine.
Output (grade 8): Three new sections were introduced: The first was a sponsored partwork the first of which was a cookery book. The second was a colour comic supplement (something new to the British Sunday newspaper market).