Uh... I'm not sure I have understood right; if you removed character's files with Clean Installer, you didn't delete those sims, but only part of their data - and this is not a healthy move for your hood, whatever your operating system is: in a nutshell you basically messed up those hood, better would be restore it from a backup before it's too late: Clean installer is not made for tinkering with hood files.
Anyway, you don't have simpe or clean installer versions for Mac OS X, and this may be a problem if you have to edit game files (with simpe) or install parts of sims2packages (clean installer). You may use them, however, just like on a non-mac pc, in a Windows virtual environment (VirtualPC, or GuestPC) if you have a PowerPC Mac (G4, G5), or natively if your machine is an Intel-based one (MacIntel), by meant of BootCamp.
Some further infos about your machine may improve our ability to help you.
I don't understand what you mean with
none of my game files will be readable, not because I'm on a Mac but because on the other machine I had Nightlife.
You mean your played saved hood (with Downtown subhood, addeed in NL), or custom files (e.g. clothing, objects, hacks, etc.)?