Complex sentence: He and his wife would have celebrated their 70th wedding anniversary on 3 November after a marriage that produced four sons and four daughters, followed by 26 grandchildren and 18 great-grandchildren.
Split into simpler sentences: He and his wife would have celebrated their 70th wedding anniversary on 3 November. Their marriage produced four sons and four daughters, followed by 26 grandchildren and 18 great-grandchildren.