( Reduction ( A ( ( process ( ( in which ) ( ( an ( atom ( or ( ion gains ) ) ) ) electrons ) ) ) . ) ) )
(ROOT (NP (RB Reduction) (DT A) (NN process) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (DT an) (NN atom) (CC or) (NN ion) (NNS gains)) (VP (VBZ electrons)))) (. .)))
Reduction A process in which an atom or ion gains electrons.
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (DT an) (NN atom)) (VP (VBZ gains) (CC or) (VBZ loses) (NP (DT an) (NN electron))))) (NP (PRP it)) (VP (VBZ becames) (NP (DT a) (PRN (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-)) (NN ion))) (. .)))