Complex sentence: In 2010 the association decided to reform itself from its base: leaving the word publisher out of its name, it opened memberships status to the public, positioning itself from a publisher's association to a fan association.
Split into simpler sentences: In 2010 the association decided to reform itself from its base: it left the word publisher out of its name and opened memberships to the public. Int he future it positioned itself from a publisher's association to a fan association.