He required treatment for apnea prematurity with caffeine, which he also remains on at the time of this dictation.
 He had apnea as a result of prematurity
(ROOT (S (NP (PRP He)) (VP (VBD required) (NP (NP (NN treatment)) (PP (IN for) (NP (NP (NN apnea) (NN prematurity)) (PP (IN with) (NP (NP (NN caffeine)) (, ,) (SBAR (WHNP (WDT which)) (S (NP (PRP he)) (ADVP (RB also)) (VP (VBZ remains) (PRT (IN on)) (PP (IN at) (NP (NP (DT the) (NN time)) (PP (IN of) (NP (DT this) (NN dictation)))))))))))))) (. .)))
(ROOT (S (NP (PRP He)) (VP (VBD had) (NP (NN apnea)) (PP (IN as) (NP (NP (DT a) (NN result)) (PP (IN of) (NP (NN prematurity))))))))
( He ( ( required ( treatment ( for ( ( apnea prematurity ) ( with ( ( caffeine , ) ( which ( he ( also ( ( remains on ) ( at ( ( the time ) ( of ( this dictation ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
( He ( ( had apnea ) ( as ( ( a result ) ( of prematurity ) ) ) ) )