The infant received CPAP briefly but then was intubated because of poor air movements.
 The infant was delivered prematurely
(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 was) (VP (VBN delivered) (ADVP (RB prematurely))))))
( ( The infant ) ( ( ( ( received ( CPAP briefly ) ) but ) ( then ( was ( intubated ( because ( of ( poor ( air movements ) ) ) ) ) ) ) ) . ) )
( ( The infant ) ( was ( delivered prematurely ) ) )