Complex sentence: The game belongs to the "Chrono" series and is a "gaiden", or side story, to the 1995 game "Chrono Trigger", released to complement its predecessor's plot, and later serving as inspiration for "Chrono Cross".
Split into simpler sentences: The game belongs to the "Chrono" series and is a "gaiden", or side story, to the 1995 game "Chrono Trigger". It was released to complement its predecessor's plot, and later served as inspiration for "Chrono Cross".