Can a sentence (subject+verb+object) follow a preposition? There is an example sentence I think it’s wrong.
XYZ showed how certain protein molecules repair DNA damaged by UV light. These discovery provided us insight into how the living cells work and the causes of cancer.
I think it should be
XYZ showed how certain protein molecules repair DNA damaged by UV light. These discovery provided us insight into how the living cells being worked and the causes of cancer.
Am I wrong? Why? If I’m right why? I wonder because I see generally a sentence after preposition with being instead of am/is/are or verb.