The infant received CPAP briefly but then was intubated because of poor air movements.
 The infant received breathing support
(ROOT (S (NP (DT The) (NN infant)) (VP (VP (VBD received) (NP (NNP CPAP) (NN briefly))) (CC but) (S (ADVP (RB then)) (VP (VBD was) (VP (VBN intubated) (PP (IN because) (IN of) (NP (JJ poor) (NN air) (NNS movements))))))) (. .)))
(ROOT (S (NP (DT The) (NN infant)) (VP (VBD received) (NP (NN breathing) (NN support)))))
( ( The infant ) ( ( ( ( received ( CPAP briefly ) ) but ) ( then ( was ( intubated ( because ( of ( poor ( air movements ) ) ) ) ) ) ) ) . ) )
( ( The infant ) ( received ( breathing support ) ) )