( ( The ( Sun ( and ( Solar System ) ) ) ) ( ( are ( revolving ( around ( ( the center ) ( of ( the Galaxy ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNP Sun) (CC and) (NNP Solar) (NNP System)) (VP (VBP are) (NP (NP (VBG revolving)) (PP (IN around) (NP (NP (DT the) (NN center)) (PP (IN of) (NP (DT the) (NNP Galaxy))))))) (. .)))
The Sun and Solar System are revolving around the center of the Galaxy.
(ROOT (S (NP (DT The) (NN sun)) (VP (VBZ is) (NP (NP (DT the) (NN center)) (PP (IN of) (NP (PRP$ our) (JJ solar) (NN system))))) (. .)))
The sun is the center of our solar system.