As the file says. It's a Nativity scene with Mary, Joseph and a baby Jesus.
This is just a deco mesh don't expect the baby to cry or the star to sparkle in the night sky!
Hope it fits in with your Sims Christmas themes.
Note: Please feel free to re-colour this mesh as I believe it is quite easy. If you have the time and you can be bothered then by all means re-UV map it and do a better job than I did (I wont be mad unless you don't send it to me!)