Divorce with alimony after 16 years of marriage

Dear sir! I urgently seek your advice with regard to my sister's marital life.It's been almost 16 years hence she had been married but right from the very first day till now she had been facing extreme mental as well as physical abuse.Under pressure we tried to fulfill every demands of my sister's inlaws.But even after marriage her husband and her in laws kept asking for dowry and had tortured her a lot.She went to file complaint in a nearby police station but the matter has been suppressed with involvement of Thana incharged(may be he was bribed).Even after all their attempts when my sister didn't bring further dowry for her in laws ,they adopted another strategy.They asked my sister's husband to keep mentally and physically torturing my sister without actually asking for dowry ,so as to provoke her to commit suicide.My sister has two children ,both aging above 8 years.After facing all these years of toutures and truma(physical as well as mental) android expecting every thing to get back on track some day,she has finally gave up and has decided to get separated from her husband.I should remind you at this point that she bore all her expenses as well as of her children all these years on herself and not even a single penny was contributed on behalf of her husband or her in-laws.Being a conservative society you could better understand that she was very hesitant of being separated from her husband.The present situation is that She can't even approach a nearby police station as she fears that who so ever will be Thana incharge,he might get bribed and ultimately she might be asked to quit under pressure. With lots of expectations of some sincere suggestions on your behalf.....Kindly guide me.