Complex sentence: He was a member of the Institutes of Archaeology and History at the "Patria de Módena" and a lead writer for the Austrian Institute of Archaeology and the Academy of the History of Madrid.
Split into simpler sentences: He was a member of the Institutes of Archaeology and History at the "Patria de Módena". And was a lead writer for the Austrian Institute of Archaeology and the Academy of the History of Madrid.