(S (S (NP (NP (BASENP (DT The) (NN effect)) (PP (IN of) (BASENP (PRPD his) (NN tax) (CC and) (NN spend) (NN reduction) (NNS plans)))) (PP (IN on) (BASENP (NN state) (JJ social) (NN provision)))) (VP (VP (VBZ has) (RB not)) (VP (ADVP (RB yet)) (VP (VBN been) (VP (VBN explained)))))) (PERIOD .))