Complex sentence: In the spring of 1998, long after the initial release date, Conker's Quest got renamed to Twelve Tales and 1999 his very first game that he headlined himself was released, Conker's Pocket Tales for Game Boy Color.
Split into simpler sentences: In the spring of 1998, long after the initial release date, Conker's Quest was renamed as Twelve Tales. In 1999 Conker himself headlined for the first time in Conker's Pocket Tales for Game Boy Color.