( ( The ( earliest ( land arthropods ) ) ) ( ( were millipedes ) . ) )
(ROOT (S (NP (DT The) (JJS earliest) (NN land) (NNS arthropods)) (VP (VBD were) (ADJP (JJ millipedes))) (. .)))
The  earliest land arthropods were millipedes.
(ROOT (S (NP (NP (DT The) (NN majority)) (PP (IN of) (NP (NNS arthropods)))) (VP (VBP live) (PP (IN on) (NP (NN land)))) (. .)))