(S (S (BASENP (NN One) (NN witness)) (VP (VBZ reports) (SBAR (IN that) (S (S (BASENP (DT the) (NN plane)) (VP (VBD was) (PP (IN at) (NP (DT a) (NP (ADJP (QP (BASENP (NN 30)) (PP (TO to) (BASENP (NN 40)))) (NN degree)) (NN angle)))))) (SBAR (WHADVP (WRB when)) (S (BASENP (PRP it)) (VP (VBD smashed) (PP (IN into) (BASENP (DT the) (NN terrain)))))))))) (PERIOD .))