Complex sentence: Mr. Malhotra is having problems in his company which, unknown to anyone, have been cause by his brother Papaji (Avtar Gill) who has placed a spy M.R.Poplet (Girish Dhamija) to sabotage the company so that he (Papaji) can take it over.
Split into simpler sentences: Mr. Malhotra is having problems in his company that, unknown to anyone, are caused by his brother Papaji (Avtar Gill). He has placed a spy, M.R. Poplet (Girish Dhamija), to sabotage the company so that he (Papaji) can take it over.