In America, his colleagues are mostly defeated (Miss Mudd, his predecessor on his first job, has retired early in disgust) when they aren't sadistic.
( ( In America ) ( , ( ( his colleagues ) ( ( ( are mostly ) ( ( defeated ( -LRB- ( ( ( ( ( ( Miss Mudd ) , ) ( ( his predecessor ) ( on ( his ( first job ) ) ) ) ) , ) ( has ( ( retired early ) ( in disgust ) ) ) ) -RRB- ) ) ) ( when ( they ( ( are n't ) sadistic ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (NNP America))) (, ,) (NP (PRP$ his) (NNS colleagues)) (VP (VBP are) (ADVP (RB mostly)) (VP (VBN defeated) (PRN (-LRB- -LRB-) (S (NP (NP (NNP Miss) (NNP Mudd)) (, ,) (NP (NP (PRP$ his) (NN predecessor)) (PP (IN on) (NP (PRP$ his) (JJ first) (NN job)))) (, ,)) (VP (VBZ has) (VP (VBN retired) (ADVP (RB early)) (PP (IN in) (NP (NN disgust)))))) (-RRB- -RRB-)) (SBAR (WHADVP (WRB when)) (S (NP (PRP they)) (VP (VBP are) (RB n't) (ADJP (JJ sadistic))))))) (. .)))
When his colleagues aren't sadistic, they are mostly defeated, so that is why the system is changing.
( ( ( ( ( ( When ( ( his colleagues ) ( ( are n't ) sadistic ) ) ) ( , ( they ( ( are mostly ) defeated ) ) ) ) , ) so ) ( that ( is ( why ( ( the system ) ( is changing ) ) ) ) ) ) . )
(ROOT (S (S (SBAR (WHADVP (WRB When)) (S (NP (PRP$ his) (NNS colleagues)) (VP (VBP are) (RB n't) (ADJP (JJ sadistic))))) (, ,) (NP (PRP they)) (VP (VBP are) (ADVP (RB mostly)) (VP (VBN defeated)))) (, ,) (IN so) (S (NP (DT that)) (VP (VBZ is) (SBAR (WHADVP (WRB why)) (S (NP (DT the) (NN system)) (VP (VBZ is) (VP (VBG changing))))))) (. .)))