German phrase
Seit ~ hat sich ~ geändert.
Meaning
Since ___, ___ has changed
When to use it
It marks a change over time. Use it when an event or period made things different.
Example dialogue
Seitdem Umzughat sichmein Alltaggeändert.
Since the move, my daily life has changed.
Wirklich? Was hat sich denn genau geändert?
Really? What exactly has changed?