(S (S (NP (BASENP (JJ Recent) (NNS changes)) (PP (TO to) (NP (BASENP (NN some)) (PP (IN of) (BASENP (DT the) (NNP Wikipedia) (NN editing) (NNS policies)))))) (VP (VBP have) (VP (VBN attempted) (S (VP (TO to) (VP (VB resolve) (NP (BASENP (NN some)) (PP (IN of) (NP (BASENP (DT the) (NN reliability) (NNS issues)) (VP (VBN raised))))))))))) (PERIOD .))