( ( The ( social Planets ) ) ( ( ( ( are ( ( Jupiter and ) Saturn ) ) , ) ( while ( ( ( the ( outer Planets ) ) ( -LRB- ( ( ( Uranus , ) ( ( Neptune and ) Pluto ) ) -RRB- ) ) ) ( ( fix ( their gaze ) ) ( on ( the ( external world ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ social) (NNS Planets)) (VP (VBP are) (NP (NNP Jupiter) (CC and) (NNP Saturn)) (, ,) (SBAR (IN while) (S (NP (NP (DT the) (JJ outer) (NNS Planets)) (PRN (-LRB- -LRB-) (NP (NNP Uranus)) (, ,) (NP (NNP Neptune) (CC and) (NNP Pluto)) (-RRB- -RRB-))) (VP (VB fix) (NP (PRP$ their) (NN gaze)) (PP (IN on) (NP (DT the) (JJ external) (NN world))))))) (. .)))
The social Planets are Jupiter and Saturn, while the outer Planets (Uranus, Neptune and Pluto) fix their gaze on the external world.
(ROOT (S (NP (NNS Uranus)) (VP (VBZ is) (NP (DT the) (ADJP (JJS least) (JJ massive)) (JJ outer) (NN planet))) (. .)))