Complex sentence: Luis Guillermo Solís Rivera is a candidate for the 2014 Costa Rican general presidential election, running under the banner of the Citizens' Action Party (PAC for its Spanish initials).
Split into simpler sentences: Luis Guillermo Solís Rivera is a candidate for the 2014 Costa Rican general presidential election. He is running under the banner of the Citizens' Action Party (PAC for its Spanish initials).