( ( ( This system ) ( of ( planets ( , ( moons ( , ( and debris ) ) ) ) ) ) ) ( ( , ( ( all ( ( held together ) ( by ( ( the gravity ) ( of ( the Sun ) ) ) ) ) ) , ) ) ( ( is ( called ( the ( Solar System ) ) ) ) . ) ) )
(ROOT (S (NP (NP (DT This) (NN system)) (PP (IN of) (NP (NNS planets) (, ,) (NNS moons) (, ,) (CC and) (NN debris)))) (PRN (, ,) (S (NP (DT all)) (VP (VBD held) (ADVP (RB together)) (PP (IN by) (NP (NP (DT the) (NN gravity)) (PP (IN of) (NP (DT the) (NNP Sun))))))) (, ,)) (VP (VBZ is) (VP (VBN called) (NP (DT the) (NNP Solar) (NNP System)))) (. .)))
This system of planets, moons, and debris, all held together by the gravity of the Sun, is called the Solar System .
(ROOT (S (NP (NP (DT The) (NN sun)) (CC and) (NP (NP (DT all) (NNS objects)) (VP (VBN held) (PP (IN by) (NP (NP (PRP it) (POS 's)) (NN gravity)))))) (VP (VBP make) (PRT (RP up)) (NP (DT the) (JJ solar) (NN system))) (. .)))