Share content between sites SharePoint 2013

Hi folks,

I have 2 sites on sharePoint 2013 (intranet site + Internet site), each one has its own content (lists, master page, etc...) except some pages like "about us", "daily news"... 

My problem is the following:

The content administrator is doing the work twice; when he wants to add/ edit those pages content he needs to add/edit it in the intranet site AND in the internet site...

Then, i want to have some solution to that allowing this user to add/edit content ine the intranet site and the content of the internet site would be updated automatically... Is there any way to do this?

Any help will be appreciated