Complex sentence: Carlos Diego Mesa Gisbert (born August 12,1953) is a historian and former Vice President of Bolivia August 2002 to October 2003 President of Bolivia, holding office from October 17,2003 until his resignation on June 6,2005.
Split into simpler sentences: Carlos Diego Mesa Gisbert (born August 12,1953) is a Bolivian historian and former politican. He was Vice President of Bolivia from August 2002 to October 2003 and then became President, holding office from October 17,2003 until his resignation on June 6,2005.