The Sims 2: Super Collection Crashing upon start - how to fix?

Tough to tell, but how much free space do you have & have you repaired the drive with Disk Utility?

Safe Mode, shut down the computer completely, then power it on and immediately press and hold the Shift key until the login window appears with "Safe Boot" in the menu bar. This process verifies the startup disk, loads essential kernel extensions, and prevents some software from automatically loading. 

For Apple silicon Macs: 

1. Shut down your Mac completely. 
2. Press and hold the power button until "Loading startup options" appears. 
3. Select your startup disk (usually Macintosh HD). 
4. Press and hold the Shift key, then click "Continue in Safe Mode". 
5. The computer will restart automatically, and you should see "Safe Boot" in the menu bar. 

To exit Safe Mode: 

• Restart your Mac normally. 
• Shut down your Mac and start it up again. 

Moving from macOS 14 Sonoma to macOS Sequoia seems to indicate the Developers of this application need to do some work to make their application function on Sequoia 15.6

How to contact an app developer - Apple Support (CA)

Follow the previous advise from @BDAqua - First 

Just to clarify 

“ I bought The Sims 2: Super Collection in July 2024 “  which would mean the M3 MBA would have only been running macOS 14 Sonoma at that time  as macOS 15 Sequoia was only released Sept 16, 2024

Did the game function well at that time ?

When was this computer upGraded to macOS 15 Sequoia.?

Did the game function fine on an earlier version of Sequoia ?

Has it only started to crash since installing Sequoia 15.6  released Jul 29, 2025 ?

That crash was due to a NULL pointer bug, which resulted in a very predictable segmentation fault. Some piece of code tried to dereference a pointer that held the address 0. Normally that is a special value that means that a link currently leads nowhere, e.g., in the list "A --> B --> C --> NULL", the NULL would indicate that C was the last item. If, say, a piece of code carelessly followed the link from C to the "next item" without testing to see whether if there was a next item, the CPU would act like a club bouncer to help show the buggy code the error of its ways.

I couldn't tell you which particular piece of code has this bug. The developers of "The Sims 2" might be able to do so – if they had the full crash report, or if they were able to replicate this crash for themselves. But the bug type is very recognizable and is a common "cause of death" for buggy applications.

"Do not follow the NULL pointer, for only chaos and madness await thee at its other end."