Issue with this French translation?

I've been practising my translation lately and come across this: Old people nowadays are in better health than they were twenty years ago. Les personnes âgées sont en meilleure santé de nos jours qu’elles ne l’étaient il y a 20 ans. I'm confused where the 'ne' and 'le' have appeared... show more I've been practising my translation lately and come across this:

Old people nowadays are in better health than they were twenty years
ago.

Les personnes âgées sont en meilleure santé de nos jours qu’elles ne l’étaient il y
a 20 ans.

I'm confused where the 'ne' and 'le' have appeared from? Is the 'ne' something to do with a comparative structure?
2 answers 2