( We ( ( ( ( call ( ( the year ) ( a shanah ) ) ) , ) ( because ( that ( 's ( ( the time ) ( it ( takes ( for ( the ( earth ( to ( ( repeat ( its revolution ) ) ( around ( ( the sun ) ( every year ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP We)) (VP (VBP call) (S (NP (DT the) (NN year)) (NP (DT a) (NN shanah))) (, ,) (SBAR (IN because) (S (NP (DT that)) (VP (VBZ 's) (NP (NP (DT the) (NN time)) (SBAR (S (NP (PRP it)) (VP (VBZ takes) (PP (IN for) (NP (DT the) (NN earth) (S (VP (TO to) (VP (VB repeat) (NP (PRP$ its) (NN revolution)) (PP (IN around) (NP (NP (DT the) (NN sun)) (NP (DT every) (NN year))))))))))))))))) (. .)))
We call the year a shanah, because that's the time it takes for the earth to repeat its revolution around the sun every year.
(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))) (. .)))