( ( The year ) ( ( is ( based ( on ( ( one ( complete revolution ) ) ( of ( ( the earth ) ( around ( the sun ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN year)) (VP (VBZ is) (VP (VBN based) (PP (IN on) (NP (NP (CD one) (JJ complete) (NN revolution)) (PP (IN of) (NP (NP (DT the) (NN earth)) (PP (IN around) (NP (DT the) (NN sun))))))))) (. .)))
The year is based on one complete revolution of the earth around the sun.
(ROOT (S (NP (NNP Earth)) (VP (VBZ makes) (NP (DT a) (JJ complete) (NN revolution)) (NP (ADVP (IN around) (NP (DT the) (NN sun)) (PP (IN about) (ADVP (RB once)))) (DT every) (NN year))) (. .)))