@Serenoz99 It's helped some people on Big Sur to start with a clean user folder. This doesn't mean getting rid of all your saves and other content; it's just about starting fresh and then adding back content if the game is stable.
Move your entire Sims 3 folder out of Documents > Electronic Arts and onto your desktop. When you launch the game, a clean folder will spawn with no content. Don't add anything to it yet; just see how the game runs. If you still see crashing issues, please turn down water and tree detail to the minimum settings and test again. Whenever you change a graphics setting, other than the in-game resolution or the fullscreen status, be sure to do so at the Main Menu and then quit to desktop before loading a save.
If turning down those settings doesn't help, try playing in windowed mode instead.
By the way, your graphics chip is below the minimum requirement for the 64-bit version of Sims 4. That doesn't necessarily mean you can't play, just that the game may not run all that well.
@puzzlezaddict I played it for roughly a half-hour, and it seems to be working! Interesting, since I did a fresh install of the game when I downloaded Big Sur....Hopefully, it'll keep it up, but thanks for your help.
