If I may just add, Steve, the passé composé indicates an action in the past which is finished. The imparfait gives a sense of duration to the action and is often translated by 'was/were , being/doing ...'
In this case,
The headmaster welcomed the students in the morning ( active voice):
Le directeur a accueilli les étudiants ce matin.
or as in the text,
The students were welcomed by the headmaster in the morning ( passive voice):
Les étudiants ont été accueillis par le directeur ce matin.
This is the same action viewed from different perspectives but in both cases the passé composé is used and we are assuming that the action has taken place earlier in the day.
Hope this helps!
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