Demikian harap maklum. demikian harap menjadi perhatiannya, demikian harap

 Demikian harap maklum, demikian harap menjadi perhatiannya, Salam sejahtera

 Demikian harap maklum = So please understand

Demikian harap menjadi perhatiannya = 

So hope it becomes his attention

Salam sejahtera = best regards

Thank you for your attention and cooperation