YOU SAID:

the hamburger was eating by clients

INTO JAPANESE

ハンバーガーは客が食べていた

BACK INTO ENGLISH

The hamburger was eaten by a customer

INTO JAPANESE

ハンバーガーはお客さんに食べられました

BACK INTO ENGLISH

The hamburger was eaten by the customer

INTO JAPANESE

ハンバーガーはお客様に食べられました

BACK INTO ENGLISH

The hamburger was eaten by the customer