( Today ( we ( ( ( think ( of ( the sun ) ) ) ( as ( being ( ( the center ) ( of ( the ( solar system ) ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (NN Today)) (NP (PRP we)) (VP (VBP think) (PP (IN of) (NP (DT the) (NN sun))) (PP (IN as) (S (VP (VBG being) (NP (NP (DT the) (NN center)) (PP (IN of) (NP (DT the) (JJ solar) (NN system)))))))) (. .)))
Today we think of the sun as being the center of the solar system.
(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.