"增加有利条件" can be translated into English as "increase favorable conditions" or "create more advantageous circumstances".
Both expressions convey the idea of adding or generating conditions that are beneficial or conducive to a particular outcome. Here are some example sentences:
1、 We need to increase favorable conditions for the project's success.
（我们需要为项目的成功增加有利条件。）
2、 By improving infrastructure, we can create more advantageous circumstances for economic development.
（通过改善基础设施，我们可以为经济发展创造更有利的条件。）