How do I bring a sim back to life???

If u have University, u can use the Ressurect-O-Nomitron to call the Grim Reaper and bring them back.

It's a career reward in the Paranormal job. I've never tried it, but I have one just in case.

If u have the universiteit game, u will have the Paranormal Phone of Resurrection. u can unlock this door using the boolprop testingcheatsenabled true code. Then u will control shift c and then in the box type: unlockallcareerrewards. I'm pretty sure that is how u do it. Then the phone will be unlocked and so will other really cool objects. If it says error type exit. Then check one of the websites with Sims 2 cheats.
Hope that helps! :)

If u don't have other sims on the lot u just don't save your game, if u do, use the expansion pack, University, that comes with the phone in the aspiration rewards, of u can use another sim to beg the grim reaper, where u might have a chance, and he might want money from u in which case u use the cheat: motherlode .

Well,i don't actually know if this is gonna work but try, click ctrl+shift+c and write in boolprop TestingCheatsenabled true,then shift+click on a sim. Click Spawn and then Tombstone of life and dead. There will be a grave near your sim. Click add sim to the family of something like that. If it comes alot of names then click on a sim's head and try another one that is similar. Click the name of the sim,and he of she will toon up. If it dies then didn't work. Sorry if it don't work..

well i havent played in a while(because we just moved and i amtrying to find the game) but i think if u get the Tombstone of life and death there is this option that u can add someone to the family and most of the time if u go through the lijst u can find the name of the deceased and have them back.
i really dont remember all to well so i dont remember if it works
sorry if this isnt any of use to you