( ( Though ( ( the ( Solar System ) ) ( has ( no ( coreless planets ) ) ) ) ) ( , ( ( chondrite ( ( asteroids and ) meteorites ) ) ( ( are common ) . ) ) ) )
(ROOT (S (SBAR (IN Though) (S (NP (DT the) (NNP Solar) (NNP System)) (VP (VBZ has) (NP (DT no) (JJ coreless) (NNS planets))))) (, ,) (NP (JJ chondrite) (NNS asteroids) (CC and) (NNS meteorites)) (VP (VBP are) (ADJP (JJ common))) (. .)))
Though the Solar System has no coreless planets, chondrite asteroids and meteorites are common.
(ROOT (S (NP (NP (NNS Meteorites)) (, ,) (VP (VBN formed) (PP (IN of) (NP (NN split) (NNS asteroids) (CC or) (NN planetary) (NNS rocks)))) (, ,)) (VP (VBP provide) (NP (NP (NNS clues)) (PP (IN about) (NP (PRP$ our) (JJ solar) (NN system))))) (. .)))