(S (S (SBAR (WHNP (WP What)) (S (VP (VBZ is) (VP (VBN believed) (S (VP (TO to) (VP (VB be) (NP (NP (ADJP (BASENP (DT the) (NN world) (POS 's)) (JJS oldest)) (BASENP (NN leather) (NN shoe))) (PRN (COMMA ,) (ADJP (BASENP (QP (RB over) (NN 5,500)) (NN year)) (JJ old)) (COMMA ,)))))))))) (VP (VBZ has) (VP (VBN been) (VP (VP (VBN found) (PP (IN in) (NP (BASENP (DT a) (NN cave)) (PP (IN in) (BASENP (NNP Armenia)))))) (PP (IN by) (NP (BASENP (DT a) (NN team)) (PP (IN of) (BASENP (NNS archaeologists))))))))) (PERIOD .))