Beginning at 8:52, the controller made repeated attempts to reach the crew of United 175.
( ( Beginning ( at 8:52 ) ) ( , ( ( the controller ) ( ( ( made ( repeated attempts ) ) ( to ( reach ( ( the crew ) ( of ( United 175 ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (VBG Beginning) (PP (IN at) (NP (CD 8:52)))) (, ,) (NP (DT the) (NN controller)) (VP (VBD made) (NP (VBN repeated) (NNS attempts)) (S (VP (TO to) (VP (VB reach) (NP (NP (DT the) (NN crew)) (PP (IN of) (NP (NNP United) (CD 175)))))))) (. .)))
The controller cared about the crew of United 175, so he tried to contact them several times.
( ( ( ( ( ( The controller ) ( cared ( about ( ( the crew ) ( of ( United 175 ) ) ) ) ) ) , ) so ) ( he ( tried ( to ( ( contact them ) ( several times ) ) ) ) ) ) . )
(ROOT (S (S (NP (DT The) (NN controller)) (VP (VBD cared) (PP (IN about) (NP (NP (DT the) (NN crew)) (PP (IN of) (NP (NNP United) (CD 175))))))) (, ,) (IN so) (S (NP (PRP he)) (VP (VBD tried) (S (VP (TO to) (VP (VB contact) (NP (PRP them)) (NP (JJ several) (NNS times))))))) (. .)))