The Sims 4 Crashing and you get the XC_BAD_ACCESS (SIGSEGV) Error under El Captain.
It looks like you are probably suffering from the NVIDIA / El Capitan issue. You should update your graphics driver manually through NVIDIA’s site
Find out what graphics card runs

Which models and Graphic Cards are affected
- Late 2012 21″ iMac – Model Identifier 13,1 – Model No. A1418
- Late 2012 27″ iMac – Model Identifier 13,2 – Model No. A1419
- Late 2013 21″ iMac – Model Identifier 14,1 – Model No. A1418
- Late 2012 15″ MacBook Pro – Model Identifier 9,1 – Model No. A1286 (650M 512 MB)
- NVIDIA GeForce GT 640M 512Mb
- NVIDIA GeForce GT 650M 512 MB
- NVIDIA GeForce GTX 660M 512 MB
- NVIDIA GeForce GTX 675MX 1024 MB
- NVIDIA GeForce GT 750M 1024 MB
- NVIDIA GeForce GT 755M 1024 MB