( Science ( ( ( is then ) ( based ( on ( direct ( ( observation and ) experimentation ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Science)) (VP (VBZ is) (ADVP (RB then)) (VP (VBN based) (PP (IN on) (NP (JJ direct) (NN observation) (CC and) (NN experimentation))))) (. .)))
Science is then based on direct observation and experimentation.
(ROOT (S (NP (NNP Science)) (VP (VBZ is) (NP (NP (DT a) (NN process)) (PP (IN of) (S (VP (VBG knowing) (PP (IN about) (NP (DT the) (JJ natural) (NN universe))) (PP (IN through) (NP (NN observation) (CC and) (NN experimentation)))))))) (. .)))