including the number of years in operation, your large volume sale discount deals as well as your present client base.
今句话不是很完整,准确译有些困难
including the number of years in operation
可译为：包括有效年限（或实施年数）
your large volume sale discount deals as well as your present client base.
大订单的销售优惠折扣同你现有的客户群体一样对待.