Complex sentence: Sissel released her second USA album "My Heart," in March 2004, a classical crossover album, which also included two pop songs written by Richard Marx and one ballad "Wait A While" written by Jon Lord of Deep Purple.
Split into simpler sentences: Sissel released her second USA album, "My Heart," in March 2004. It was classical crossover album and included two pop songs written by Richard Marx and one ballad, "Wait a While", written by Jon Lord of Deep Purple.