Complex sentence: In 1947, he co-founded the Football Writers'Association, and from September 1951 edited his own football magazine entitled "Charles Buchan's Football Monthly", which was published for another 23 years altogether.
Split into simpler sentences: In 1947, he co-founded the Football Writers'Association. From September 1951 he edited his own football magazine entitled "Charles Buchan's Football Monthly", which was published for another 23 years altogether.