Complex sentence: A major work having developed the theory is the Seguin Report, commissioned by then Parti Québécois (PQ) Premier of Quebec Bernard Landry and completed under the now former Liberal Quebec Minister of Finance Yves Séguin.
Split into simpler sentences: A major work having developed the theory is the "Seguin Report", commissioned by then "Parti Québécois" (PQ) Premier of Quebec Bernard Landry. It was completed under the now former Liberal Quebec Minister of Finance Yves Séguin.