Complex sentence: The first manga was originally serialized in "Young Magazine" from 1989 to 1990 and was followed by a sequel,, from 1990 to 1997; each series was published as its own "Tankōbon" volume by YoungKC/Kodansha in 1991 and 2001, respectively.
Split into simpler sentences: The first manga was originally serialized in "Young Magazine" from 1989 to 1990 and was followed by a sequel,, from 1990 to 1997. Each series was published as its own "Tankōbon" volume by YoungKC/Kodansha in 1991 and 2001, respectively.