Complex sentence: Eusko Alkartasuna is a Basque nationalist political party operating in Spain and France, translated as "Basque Solidarity" and abbreviated as EA, is a party which describes itself as a "Basque national, democratic, popular, progressive and non-denominational party".
Split into simpler sentences: Eusko Alkartasuna is a Basque nationalist political party operating in Spain and France. The party describes itself as a "Basque nationalist, democratic, popular, progressive and non-denominational party".