Complex sentence: The ICU had published magazines in the past such as the "Irish Chess Journal" for members of the association, in recent years to reduce costs this has been curtailed since 2007 to a biannual online magazine.
Split into simpler sentences: The ICU had published magazines in the past such as the "Irish Chess Journal" for members of the association. Since 2007, to reduce costs, this has been curtailed to a biannual online magazine.