(S (S (BASENP (DT The) (JJ new) (NNS fossils)) (VP (VBP say) (SBAR (IN that) (S (BASENP (DT the) (NN split)) (VP (MD may) (VP (VB have) (VP (VBN happened) (ADVP (NP (QP (ADJP (ADJP (RB as) (JJ long)) (IN as)) (BASENP (NN 10.5) (NN million))) (NNS years)) (RB ago))))))))) (PERIOD .))