( ( ( ( ( ( The Aqua-Lung ) ( ( ( used ( cylinders ( of ( compressed air ) ) ) ) and ) ( was ( equipped ( with ( ( ( a ( demand regulator ) ) , ) ( which ( ( adjusted ( the ( air pressure ) ) ) automatically ) ) ) ) ) ) ) ) , ) and ) ( supplying ( ai ( r ( as ( ( the diver ) ( needed it ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (DT The) (NN Aqua-Lung)) (VP (VP (VBD used) (NP (NP (NNS cylinders)) (PP (IN of) (NP (JJ compressed) (NN air))))) (CC and) (VP (VBD was) (ADJP (VBN equipped) (PP (IN with) (NP (NP (DT a) (NN demand) (NN regulator)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBD adjusted) (NP (DT the) (NN air) (NN pressure)) (ADVP (RB automatically))))))))))) (, ,) (CC and) (S (S (VP (VBG supplying))) (VP (VBZ ai) (SBAR (NP (SYM r)) (IN as) (S (NP (DT the) (NN diver)) (VP (VBD needed) (NP (PRP it))))))) (. .)))
The Aqua-Lung used cylinders of compressed air and was equipped with a demand regulator, which adjusted the air pressure automatically, and supplying ai r as the diver needed it.
(ROOT (S (SBAR (IN As) (S (NP (DT a) (NN diver)) (VP (VBZ descends)))) (, ,) (NP (NP (DT the) (NN increase)) (PP (IN in) (NP (NN pressure)))) (VP (VBZ causes) (NP (NP (DT the) (NN body) (POS 's)) (NN air) (NNS pockets)) (PP (IN in) (NP (NP (DT the) (NNS ears) (CC and) (NNS lungs)) (PP (TO to) (NP (NNS compress)))))) (. .)))