Complex sentence: Asakura also went off on a solo project in 2004 titled "Quantum Mechanics Rainbow", in which he released multiple CDs for a year, and each CD title name had to do with a color and math property.
Split into simpler sentences: Asakura also went off on a solo project in 2004 titled "Quantum Mechanics Rainbow". In which he released multiple CDs for a year, and each CD title name had to do with a color and math property.