(S (S (ADVP (ADVP (BASENP (NN Twenty) (NNS years)) (RBR later)) (PRN (COMMA ,) (PP (IN in) (BASENP (DT the) (NN 1960) (POS 's))) (COMMA ,))) (S (BASENP (PRP he)) (VP (VP (VBD employed) (BASENP (PRP himself))) (PP (IN as) (BASENP (DT a) (JJ full) (NN time) (NN writer)))))) (PERIOD .))