You can read it here.
In a nutshell, The Stolen Generation are the people who were taken out of their mother's care in their childhood. The Christian Church had a hand on this too because it was thought that the Aboriginal mothers would not know how to really "mother" these kidsm, so they were taken from them so that they can be "properly cared for". How idiotic was that?
I am glad a sorry has been given, it was long overdue.