Complex sentence: When the results were in CSICOP also contended that the Gauquelins had not chosen randomly, they had had difficulty finding sufficient same-week and same-village births to compare with champions born in rural areas and so had chosen only champions born in larger cities.
Split into simpler sentences: When the results were in CSICOP also contended that the Gauquelins had not chosen randomly. They had had difficulty finding sufficient same-week and same-village births to compare with champions born in rural areas and so had chosen only champions born in larger cities.