(S (S (BASENP (NNP Sorrells)) (VP (VBZ has) (VP (ADVP (RB later)) (VP (VBN claimed) (SBAR (SBAR (IN that) (S (BASENP (JJ military) (NNS helicopters)) (VP (VBP have) (VP (ADVP (RB since)) (VP (VP (VBN overflown) (BASENP (PRPD his) (NN property))) (PP (IN at) (BASENP (JJ low) (NN altitude)))))))) (CC and) (SBAR (IN that) (S (BASENP (PRP he)) (VP (VBZ has) (VP (VBN been) (VP (VBG getting) (BASENP (JJ strange) (NN phone) (NNS calls)))))))))))) (PERIOD .))