( ( Evolution ( of ( Protists Scientists ) ) ) ( ( think ( that ( protists ( are ( the ( oldest eukaryotes ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Evolution)) (PP (IN of) (NP (NNP Protists) (NNS Scientists)))) (VP (VBP think) (SBAR (IN that) (S (NP (NNS protists)) (VP (VBP are) (NP (DT the) (JJS oldest) (NNS eukaryotes)))))) (. .)))
Evolution of Protists   Scientists think that protists are the oldest eukaryotes.
(ROOT (S (NP (JJ Many) (NNS scientists)) (VP (VBP think) (SBAR (S (NP (NNS protists)) (VP (VBP are) (NP (DT the) (JJS oldest) (NNS eukaryotes)))))) (. .)))