He became even more concerned as its route changed, moving into another sector's airspace.
( He ( ( ( became ( even ( more concerned ) ) ) ( as ( ( its route ) ( ( changed , ) ( moving ( into ( ( another ( sector 's ) ) airspace ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP He)) (VP (VBD became) (ADJP (RB even) (RBR more) (JJ concerned)) (SBAR (IN as) (S (NP (PRP$ its) (NN route)) (VP (VBD changed) (, ,) (S (VP (VBG moving) (PP (IN into) (NP (NP (DT another) (NN sector) (POS 's)) (NN airspace))))))))) (. .)))
He was very concerned when the plane's route changed. 
( He ( ( ( was ( very concerned ) ) ( when ( ( ( the ( plane 's ) ) route ) changed ) ) ) . ) )
(ROOT (S (NP (PRP He)) (VP (VBD was) (ADJP (RB very) (JJ concerned)) (SBAR (WHADVP (WRB when)) (S (NP (NP (DT the) (NN plane) (POS 's)) (NN route)) (VP (VBD changed))))) (. .)))