( He ( ( considered ( ( ( ( ( the ( Copernican system ) ) , ) ( which ( ( ( modeled ( the ( Solar System ) ) ) ( with ( the Sun ) ) ) ( at ( the center ) ) ) ) ) , ) ( correct ( in ( its essence ) ) ) ) ) . ) )
(ROOT (S (NP (PRP He)) (VP (VBD considered) (SBAR (S (NP (NP (DT the) (JJ Copernican) (NN system)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBD modeled) (NP (DT the) (NNP Solar) (NNP System)) (PP (IN with) (NP (DT the) (NNP Sun))) (PP (IN at) (NP (DT the) (NN center)))))) (, ,)) (VP (VBP correct) (PP (IN in) (NP (PRP$ its) (NN essence))))))) (. .)))
He considered the Copernican system, which modeled the Solar System with the Sun at the center, correct in its essence.
(ROOT (S (NP (DT The) (NN sun)) (VP (VBZ is) (VP (VBN considered) (NP (NP (DT the) (NN center)) (PP (IN of) (NP (DT the) (JJ solar) (NN system)))))) (. .)))