Hey there,
By looking at the specs of your Mac, I can say that it is not the best model of MacBook Pro that you can play the game with. Intel Core i5, 300 GB of storage and 4GB of RAM are OK, but not your Intel HD Graphics card. To play the game properly, you need a discrete graphics card, which is NVIDIA GeForce graphics cards in this case. Looking at your graphics card, I believe you have a 13" computer?
Unfortunately, all the hardware in your Mac are built-in, which means you are stuck with what you have and there is no way to change them but buying a new computer.
However, I have some steps that you can try:
1. Run the game under low graphics. Your computer's specs can only handle low graphics. You can change the settings while The Sims 3 is open.
2. Delete all the cache files. Some files may be corrputed and deleting them will force the game re-create them. A link to tell you how to do that is here: https://help.ea.com/article/how-to-clear-your-cache-for-the-sims-3-on-a-mac
3. Do you have any mods or custom content installed? If yes, some may be out-of-date and may be conflicting with the game. Try deleting the mods or moving them out of your Mods folder to your desktop temporarily and then run the game. If your game runs properly, then there is definitely something wrong with the mods.
I hope any of these works.
Good luck and tell me if your issue is resolved or have any questions.
