( ( ( Y YEAR ) ( The interval ) ) ( ( ( required ( for ( the earth ) ) ) ( to ( complete ( ( one revolution ) ( around ( the sun ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Y) (NNP YEAR)) (NP (DT The) (NN interval))) (VP (VBD required) (PP (IN for) (NP (DT the) (NN earth))) (S (VP (TO to) (VP (VB complete) (NP (NP (CD one) (NN revolution)) (PP (IN around) (NP (DT the) (NN sun)))))))) (. .)))
Y YEAR The interval required for the earth to complete one 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))) (. .)))