https://answers.ea.com/t5/SimCity-2013/SimCity-Complete-Crashing-on-a-Mac/m-p/5012397#M114661
This problem started with the High Sierra update back in October 2017. It's been a long year for Mac mayors. Many thanks to our dedicated mayor
In the meantime, some people have had success playing SimCity on a boot camp drive or virtual Windows machine.