( Divers ( ( ( ( counteract ( this ( straitjacket effect ) ) ) ( by ( ( releasing ( compressed air ) ) ( into ( the suit ) ) ) ) ) ( as ( they descend ) ) ) . ) )
(ROOT (S (NP (NNS Divers)) (VP (VB counteract) (NP (DT this) (NN straitjacket) (NN effect)) (PP (IN by) (S (VP (VBG releasing) (NP (JJ compressed) (NN air)) (PP (IN into) (NP (DT the) (NN suit)))))) (SBAR (IN as) (S (NP (PRP they)) (VP (VBD descend))))) (. .)))
Divers counteract this straitjacket effect by releasing compressed air into the suit as they descend.
(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)))))) (. .)))