source: The Nazis forbade her to sing the song and perform on stage ever again, after this the song went over to the Allied side, where it also became popular.
target: The Nazis forbade her to sing the song and perform on stage ever again.   After this, the song went over to the Allied side.  The song became popular.
references: The Nazis forbade her to sing the song and perform on stage ever again.   After this, the song went over to the Allied side.  The song became popular.