Keep in mind, though, it’s much more important to be able to show your manager how you contributed to the company’s results (such as increased revenue or reduced cost) than just a difference in pay between you and someone else.
句首keep in mind为祈使句, 宾语由省略了that的名词性从句充当。在此从句中，使用了it作形式主语，不定式结构to be able to show your manager …作真正主语的形式，show后是双宾语结构，than并列了比较的两端，为(show your manager) how you contributed to the company’s results和just a difference in pay between you and someone else。
keep in mind 记住
contribute to 为…做贡献
It’s much better for the manager to offer a pay increase, beaming with pride over his or her good judgment in hiring you, than for you to get the same pay increase by having to ask for it.