( ( For example ) ( , ( ( a year ) ( ( is ( defined ( as ( ( the amount ) ( of ( time ( it ( takes ( for ( the ( Earth ( to ( ( make ( one ( complete revolution ) ) ) ( around ( the Sun ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN For) (NP (NN example))) (, ,) (NP (DT a) (NN year)) (VP (VBZ is) (VP (VBN defined) (PP (IN as) (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NP (NN time)) (SBAR (S (NP (PRP it)) (VP (VBZ takes) (PP (IN for) (NP (DT the) (NN Earth) (S (VP (TO to) (VP (VB make) (NP (CD one) (JJ complete) (NN revolution)) (PP (IN around) (NP (DT the) (NNP Sun))))))))))))))))) (. .)))
For example, a year is defined as the amount of time it takes for the Earth to make one complete revolution 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))) (. .)))