网友断句错误。as to是个复合介词，意为“关于，至于”， 后接who引导的疑问分句作介词宾语。on the inside为习语，意为内线、内应、提供内部消息的人。

This will give you a better idea as to who the person is on the inside.

This主语 will give谓语 you间接宾语 a better idea直接宾语 as to who the person is on the inside介词短语作直接宾语的定语.

译文：这会让你更好的了解谁是内应。