Complex sentence: Stefano Palmieri (born 18 September 1964) is a Captain Regent of San Marino together with Francesco Mussoni for the semester from 1 October 2009 to 1 April 2010.
Split into simpler sentences: Stefano Palmieri (born 18 September 1964) is a politician of San Marino. He was elected Captain Regent of San Marino together with Francesco Mussoni for the semester from 1 October 2009 to 1 April 2010.