Complex sentence: Prior to Vaticanum II the Spanish preliminary input was rather modest; on the central theme of the Church itself it was reduced to the petition, fathered by Añoveros jointly with the Jaca bishop Ángel Hidalgo Ibáñez, that the doctrine of Cuerpo Místico deserves more elaboration.
Split into simpler sentences: Prior to Vaticanum II the Spanish preliminary input was rather modest. On the central theme of the Church itself it was reduced to the petition, fathered by Añoveros jointly with the Jaca bishop Ángel Hidalgo Ibáñez, that the doctrine of Cuerpo Místico deserves more elaboration.