Complex sentence: Also around that time, the Siegel-Schwall Band became the first blues band to ever perform with a symphony, performing "Three Pieces for Blues Band and Symphony Orchestra," written by William Russo and conducted by Seiji Ozawa with the San Francisco Symphony.
Split into simpler sentences: Also around that time, the Siegel-Schwall Band became the first blues band to ever perform with a symphony. They performed "Three Pieces for Blues Band and Symphony Orchestra" with the San Francisco Symphony.