( ( In ( January 2006 ) ) ( , ( ( an exoplanet ) ( ( was ( discovered ( ( orbiting ( the star ) ) ( by ( Exoplanet Tracker ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (NNP January) (CD 2006))) (, ,) (NP (DT an) (NN exoplanet)) (VP (VBD was) (VP (VBN discovered) (S (VP (VBG orbiting) (NP (DT the) (NN star)) (PP (IN by) (NP (NNP Exoplanet) (NNP Tracker))))))) (. .)))
In January 2006, an exoplanet was discovered orbiting the star by Exoplanet Tracker.
(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))))))))))) (. .)))