Complex sentence: Tejano pop star Selena's album Dreaming of You actually debuted at number one on the album charts upon its 1995 release Dreaming of You as been the best crossover album yet.
Split into simpler sentences: Tejano pop star Selena's album Dreaming of You actually debuted at number one on the album charts. Upon its 1995 release Dreaming of You as been the best crossover album yet.