好让 (hǎoràng) means "in order to," and therefore expresses purpose. It is used in the following way:

妈妈晚上总是让她喝牛奶，好让她容易入睡。 Mother always makes her drink milk in the evening to help her fall asleep.
你要说慢点儿，好让他们明白。 You need to speak a little slower so that they can understand.
我已经把准备工作做好了，好让你们尽快开始。 I already prepared the work so that you guys can start it as soon as possible.

Structure

Examples