they don't allow they don't do that
( they ( ( do n't ) ( allow ( they ( ( do n't ) ( do that ) ) ) ) ) )
(ROOT (S (NP (PRP they)) (VP (VBP do) (RB n't) (VP (VB allow) (SBAR (S (NP (PRP they)) (VP (VBP do) (RB n't) (VP (VB do) (NP (DT that))))))))))
They don't do that and it's not permitted.
( ( ( ( They ( ( do n't ) ( do that ) ) ) and ) ( it ( ( 's not ) permitted ) ) ) . )
(ROOT (S (S (NP (PRP They)) (VP (VBP do) (RB n't) (VP (VB do) (NP (DT that))))) (CC and) (S (NP (PRP it)) (VP (VBZ 's) (RB not) (VP (VBN permitted)))) (. .)))