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Hi help please,
How do I migrate Google Sites to SharePoint Sites and Google Drive to SkyDrivePro?
About migrating Google sites to SharePoint Sites, you may learn related information from the link below : Migrate Google Apps Content to SharePoint.
Except for the links above, the way we know is to manually migrate the contents between two different products. At this time, there aren't official tools (Microsoft tools) to help with migration from Google Apps sites to Office 365 SharePoint sites.
Reference: Information about manual migration of SharePoint Online content.
Additionally, to use a more automated tool to migrate the documents, there may be some third-party tools. Please refer to the thread below :