Question

the headmaster gave him a prize (change the voice)
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Answer 1

Answer:

A prize was given to him by the headmaster

Answer 2

$\huge\bf\red{Answer :-}$

A prize was given to him by the headmaster......

ADDITIONAL INFORMATION. !!!!!!

In order to change the sentence from passive to active:

Step 1 :-

Identify the subject of the sentence - who is doing an action? The training is not doing an action, so it can't be the subject. The only person or thing doing an action here is the maintenance staff. They are attending training. So, the maintenance staff is the subject of the sentence.

Step Two:-

Rewrite the sentence so the subject is performing the action. This sentence could be rewritten to active voice as follows:

The maintenance staff had to attend extensive training on the new safety procedures.