Meine Großeltern sind, als sie jung waren, nach Afrika gegangen

meine Großeltern sind, als sie jung waren, nach Afrika gegangen
my grandparents went to Africa when they were young

The video/native speakers do NOT include the ‘sie’ curious as to why.

This is German 5 Level 13 … But not anymore

Side note:
Also, can we get MORE words and sentences with Video/Native speakers? It really does help to have both the native/faster speaking and the slower/general speaking.