Complex sentence: Mizuki was trained as an enka singer, and made her debut as a voice actress in 1998; however, she released her debut single, "Omoi", under the King Records label on December 6,2000.
Split into simpler sentences: Mizuki was trained as an enka singer, and made her debut as a voice actress in 1998. Mizuki released her debut single, "Omoi", under the King Records label on December 6,2000.