Complex sentence: He also conducted the Edmonton Symphony in a 1971 concert featuring the British rock band Procol Harum, which was recorded and released commercially as Procol Harum Live with the Edmonton Symphony Orchestra.
Split into simpler sentences: He also conducted the Edmonton Symphony in a 1971 concert featuring the British rock band Procol Harum. The music was recorded following the performance, and resulted in the successful Procol Harum Live with the Edmonton Symphony Orchestra.