Complex sentence: In 2001, on March 14, Gackt released his eighth single, "Kimi no Tame ni Dekiru Koto", which peaked at number six, and charted for 18 weeks, Gackt's record until 2009.
Split into simpler sentences: In 2001, on March 14 was released his eighth single, "Kimi no Tame ni Dekiru Koto". It peaked at number 6, and charted for 18 weeks, which was Gackt's record until 2009.