Final answer:
The sentence in passive voice would be "It has always been wanted by her to become an actor." Here, the action of wanting becomes the main focus, and the person doing the action is included at the end using "by her."
Step-by-step explanation:
The sentence "She has always wanted to become an actor" can be changed into the passive voice to express the same idea. In the passive voice, the focus is shifted from the subject to the action or the object of the action. The passive form of the sentence would be: "It has always been wanted by her to become an actor."
To construct a passive voice sentence, the object of the active sentence becomes the new subject in the passive sentence, and the original subject is either omitted or moved into a prepositional phrase starting with "by." In this case, "she" becomes "by her" as the agent performing the action, and the main verb is changed accordingly.