Complex sentence: RBC Plaza was known as Dain Rauscher Plaza until March 2008, named for Dain Rauscher Wessels, the regional brokerage and investment banking firm based in Minneapolis.
Split into simpler sentences: RBC Plaza was known as Dain Rauscher Plaza until March 2008. It was originally named for Dain Rauscher Wessels, the regional brokerage and investment banking firm based in Minneapolis.