To be responsible for clients, we company will offer excellent service of products sold.

we company ???

our

本着对客户负责的态度，我司对售出的产品将提供优质服务。(售出的在英语中可以不用翻译，不用字对字）
To be responsible for our customers, best after-sales services will be provided for our products，

Excellent after-sale services regarding our products will be provided by our company on te responsible attitude.