Complex sentence: The firm is notable primarily in the context of proving the value of open source intelligence, and was one of the six companies that responded, "pro bono", with useful open source information when asked to do so by the Aspin-Brown Commission.
Split into simpler sentences: The firm is notable primarily in the context of proving the value of open source intelligence. It was one of the six companies that responded "pro bono" with useful open source information when asked to do so by the Aspin-Brown Commission.