Complex sentence: The band enjoyed a somewhat meteoric rise to success following the release of their self-titled debut album in 1999, and the 2001 follow-up album, "Iowa", further increased the band's popularity.
Split into simpler sentences: The band enjoyed a somewhat meteoric rise to success following the release of their self-titled debut album in 1999. The 2001 follow-up album "Iowa" further increased the band's popularity.