Can anyone convert this passive voice to active voice, please. For my understanding. (I'm really confused with passive and active voice)
First of all, throughout history education has been reserved for those who have the most money.
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As noted in the comments, the difficulty with transforming passive voice to active voice is the need for a subject. In your example, who is reserving history education for those with money? Is it the rich themselves? Is it those in authority? Is it us in some sense? Once you're able/willing to identify a subject, converting to active voice becomes pretty straightforward.
This is why passive voice is used: To avoid assigning responsibility of the action to a specific agent. This might be because there's no one responsible agent, or the responsible agent is irrelevant, or you don't want to cast blame.