Complex sentence: Mr. Tang joined the HKP at 1976, as a Probationary Inspector and served many different departments in the HKP, such as the SDU (Special Duties Unit), and the District Commander of Airport.
Split into simpler sentences: Mr. Tang joined the HKP at 1976, as a Probationary Inspector. He served many different departments in the HKP, such as the SDU (Special Duties Unit), and the District Commander of Airport.