Question

Voice change
Socrates was taken away to prison

Answer 1

The original sentence which is given in passive voice is as follows:

Socrates was taken away to prison

After changing the voice of the sentence, keeping the meaning intact, the same sentence in the active voice is as follows:

They took Socrates to prison

In the active voice the phrase “by them” is implied which is converted to “they” in the passive voice.  

Answer 2

The soldiers took away Socrates to prison.