August 2017
Could you give us some more details on the matter? I'm not a star in Mac but I bet some others out here are if you could give us some more info on what the issue is and what you have tried to resolve it.
After googling I find the following ea help page on uninstalling the Sims 3:
https://help.ea.com/en-us/help/the-sims/the-sims-3/how-to-uninstall-the-sims-3-on-a-mac/
There's also this link which gives a lot of useful information but is not part of EA's websites:
https://bluebellflora.com/manually-uninstalling-an-expansion-or-stuff-pack-in-the-sims-3-for-mac/