Complex sentence: Archbishop Marcel Lefebvre, the founder of the Traditionalist Catholic group Society of St. Pius X, criticized his nomination, complaining that the function was given to "someone who is not truly of French origin".
Split into simpler sentences: Archbishop Marcel Lefebvre, the founder of the Traditionalist Catholic group Society of St. Pius X, criticized his nomination. He said that the position was being given to "someone who is not truly of French origin".