(S (S (NP (NP (BASENP (DT A) (JJ fourth) (NN painting)) (PRN (COMMA ,) (BASENP (NN Landscape)) (COMMA ,))) (PP (ADVP (RB also)) (PP (IN by) (BASENP (NNP Piet) (NNP Mondrian))))) (VP (VBD was) (VP (VBN dropped) (PP (IN by) (NP (BASENP (DT the) (NNS thieves)) (SBAR (WHADVP (WRB when)) (VP (VBN pursued) (PP (IN by) (BASENP (NN security)))))))))) (PERIOD .))