( ( 51 Pegasi ) ( ( was ( ( the ( first ( Sun-like star ) ) ) ( discovered ( to ( have ( an ( exoplanet companion ) ) ) ) ) ) ) ; ) )
(ROOT (S (NP (CD 51) (NNP Pegasi)) (VP (VBD was) (NP (NP (DT the) (JJ first) (JJ Sun-like) (NN star)) (VP (VBN discovered) (S (VP (TO to) (VP (VB have) (NP (DT an) (JJ exoplanet) (NN companion)))))))) (: ;)))
51 Pegasi was the first Sun-like star discovered to have an exoplanet companion;
(ROOT (S (NP (DT A) (PRN (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-)) (NN exoplanet)) (VP (VBZ is) (ADVP (RB often)) (VP (VBN discovered) (SBAR (IN because) (S (NP (PRP it)) (VP (VBZ causes) (NP (DT a) (NN star) (S (VP (VP (TO to) (VP (VB move))) (CC or) (VP (TO to) (VP (VB dim))))))))))) (. .)))