Complex sentence: Juan Carlos Portantiero (Buenos Aires, 1934--Buenos Aires, 9 March 2007) was an Argentine sociologist, specialized in the study of the works of Antonio Gramsci.
Split into simpler sentences: Juan Carlos Portantiero (Buenos Aires, 1934--Buenos Aires, 9 March 2007) was an Argentine sociologist. He specialized in the study of the works of Antonio Gramsci.