Translation:I bought the dishes that were on sale.
June 26, 2020
Because qui is the subject of the second clause. you can tell it's the subject because it's followed by a verb:
- ...la vaiselle qui était en promotion -> ...the dishes that were on sale
Que is used when it's the object of the clause, so it will be followed by a noun or noun phrase.
- ...que la vaiselle était en promotion -> ...that the dishes were on sale