Question

Customers are served by our staff speaking english, chinese

Answer 1

Step-by-step explanation:

客户由我们的工作人员提供服务

Kèhù yóu wǒmen de gōngzuò rényuán tígōng fúwù

Answer 2

Step-by-step explanation:

Since this is in English, I assume that the comma is not quite correct. You should use and. Also it is best to make that speak English and Chinese into a subordinate clause.

Customers are served by out staff (who) speak English and Chinese.