nadat means “after”. Starts a sub-clause and sends its verb to the very end.
Subordinating · Onderschikkend
Nadat ik gegeten had, ging ik weg.
After I had eaten, I left.
We gingen naar huis nadat de film was afgelopen.
We went home after the film had ended.
Drag scrambled words into the right Dutch order and master inversion and the verb-final rule.