Complex sentence: Since they were traditionally published in the autumn and in time for Christmas, since 1966 they had the date of the following year on the cover, unlike other annuals made by D. C. Thomson & Co. Ltd during this period where the year was added in 1965.
Split into simpler sentences: Since they were traditionally published in the autumn and in time for Christmas, since 1966 they had the date of the following year on the cover. Unlike other annuals made by D. C. Thomson & Co. Ltd where the year was added in 1965.