(S (S (S (S (ADVP (RB Historically)) (S (BASENP (CC both) (NNP Armenia) (CC and) (NNP Azerbaijan)) (VP (VP (VP (VBP lay) (BASENP (NN claim))) (PP (TO to) (NP (BASENP (DT some)) (PP (IN of) (BASENP (DT the) (JJ same) (NNS territories)))))) (COMMA ,) (NP (BASENP (DT an) (NN issue)) (VP (VBN complicated) (PP (IN by) (NP (BASENP (DT the) (NN intermingling)) (PP (IN of) (BASENP (JJ ethnic) (NNS populations)))))))))) (S (ADVP (RB so)) (S (BASENP (DT some) (NNS areas)) (VP (VBP have) (BASENP (DT no) (ADJP (RB clearly) (VBN demarcated)) (ADJP (JJ Azeri) (CC and) (JJ Armenian)) (NN border)))))) (COLON ;) (S (S (NP (BASENP (DT these) (JJ potential) (NNS sources)) (PP (IN of) (BASENP (NN conflict)))) (VP (VBD remained) (ADJP (JJ quiescent)))) (SBAR (WHADVP (WRB whilst)) (S (BASENP (DT both) (NNS nations)) (VP (VBD were) (VP (VBN subsumed) (PP (IN by) (BASENP (JJR greater) (NNS powers))))))))) (PERIOD .))