Complex sentence: At Peña Blanca, he undertook a revitalization of the church building, painting frescoes on its walls and using himself as Pontius Pilate, locals and three of his sisters as figure models.
Split into simpler sentences: At Peña Blanca, he undertook a revitalization of the church building, painting frescoes on its walls. He was his own model for the figure of Pontius Pilate, and also used locals and three of his sisters as figure models.