Complex sentence: The individual chapters are collected and published in "tankōbon" volumes by Kodansha with the first released on September 23,1989; as of December 2008,38 volumes have been released.
Split into simpler sentences: The individual chapters are collected and published in "tankōbon" volumes by Kodansha. The first volume was released on September 23,1989; as of December 2008,38 volumes have been released.