The word order remains the same, that is:
ACTOR-ACTION-RECEIVER
ACTOR-ACTION-BENEFICIARY-RECEIVER
ACTOR-ACTION-COMPLEMENT
ACTOR-ACTION-RECEIVER
Active Voice
I am eating a pizza.
Passive Voice
The pizza is being eaten by me.
ACTOR-ACTION-BENEFICIARY-RECEIVER
Active Voice
I will explain her concept.
Passive Voice
The concept will be explained to her by me.
Note: In the passive voice, NORMALLY the actor is not mentioned.
ACTOR-ACTION-COMPLEMENT
Active Voice
She was playing poker with her friend.
Passive Voice
Poker was being played by her with her friend.
Here, with her friend gives more information to the complement. That’s why it’s called the extension.
But the main point is, the basic word order remains the same.