( It ( ( ( ( completes ( ( ( ( ( one revolution ) ( around ( the Sun ) ) ) approximately ) once ) ( every ( 3 years ) ) ) ) and ) ( ( completes ( one rotation ) ) ( once ( ( every 3 ) hours ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VP (VBZ completes) (NP (NP (NP (CD one) (NN revolution)) (PP (IN around) (NP (DT the) (NNP Sun)))) (RB approximately) (RB once) (NP (DT every) (CD 3) (NNS years)))) (CC and) (VP (VBZ completes) (NP (CD one) (NN rotation)) (ADVP (RB once) (NP (QP (DT every) (CD 3)) (NNS hours))))) (. .)))
It completes one revolution around the Sun approximately once every 3 years and completes one rotation once every 3 hours.
(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))) (. .)))