( We ( then ( ( ( discuss ( the fact ) ) ( that ( it ( takes ( ( one year ) ( for ( the ( earth ( to ( orbit ( the sun ) ) ) ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (PRP We)) (ADVP (RB then)) (VP (VB discuss) (NP (DT the) (NN fact)) (SBAR (IN that) (S (NP (PRP it)) (VP (VBZ takes) (NP (NP (CD one) (NN year)) (PP (IN for) (NP (DT the) (NN earth) (S (VP (TO to) (VP (VB orbit) (NP (DT the) (NN sun)))))))))))) (. .)))
We then discuss the fact that it takes one year for the earth to orbit the sun.
(ROOT (S (NP (PRP It)) (VP (VBZ takes) (PP (IN about) (NP (NP (CD one) (NN year)) (PP (IN for) (NP (NN earth))))) (S (VP (TO to) (VP (VB orbit) (NP (DT the) (NN sun)))))) (. .)))
It takes about one year for earth to orbit the sun.