( ( As ( Earth ( orbits ( the sun ) ) ) ) ( , ( ( the sun ) ( ( appears ( to ( drift ( across ( the ( background stars ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN As) (S (NP (NNP Earth)) (VP (VBZ orbits) (NP (DT the) (NN sun))))) (, ,) (NP (DT the) (NN sun)) (VP (VBZ appears) (S (VP (TO to) (VP (VB drift) (PP (IN across) (NP (DT the) (NN background) (NNS stars))))))) (. .)))
As Earth orbits the sun, the sun appears to drift across the background stars.
(ROOT (S (PP (IN From) (NP (NN earth))) (, ,) (NP (DT the) (NN sun)) (VP (VBZ appears) (NP (NN brighter)) (PP (IN than) (NP (DT any) (JJ other) (NN star))) (SBAR (IN because) (S (NP (DT the) (NN sun)) (VP (VBZ is) (NP (DT the) (JJS closest) (NN star))))))))