(S (S (NP (BASENP (DT The) (JJ Zaidi) (NN insurgent) (NN group)) (PRN (COMMA ,) (VP (ADVP (RB also)) (VP (VBN known) (PP (IN as) (BASENP (NNP Houthis))))) (COMMA ,))) (VP (VBP have) (VP (VBN been) (VP (VP (VBG fighting) (PP (IN for) (BASENP (JJ northern) (NN independence)))) (PP (IN for) (BASENP (DT the) (JJ past) (NN half) (NN decade))))))) (PERIOD .))