Complex sentence: The ICV forms part of the tripartite coalition (along with the Catalan Socialist Party-PSC and the ERC, a left-wing Catalan Nationalist Party), that has governed Catalonia since the 2004 General Election.
Split into simpler sentences: The ICV forms part of the tripartite coalition (along with the Catalan Socialist Party-PSC and the ERC, a left-wing Catalan Nationalist Party). The coalition has governed Catalonia since the 2004 General Election.