The highest amount of money spent on teachers' salaries for all the concerned years.
The highest amount of money was spent on teachers' salaries for all the concerned years.
Consider these simpler examples. Active voice - Tom spent money. Passive voice - Money was spent (by Tom).
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Consider these simpler examples.
Active voice - Tom spent money.
Passive voice - Money was spent (by Tom).
Now try to use them to check your 2 sentences above.
Clive