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Coronavirus and Vaccine Scientists of the University of Oxford, they made a vaccine and test on monkey in last year, it works well. Scientists hope get approved from regulators, then they can conduct the clinical trial. However, scientists not sure the humans have the same immunity as monkeys. Health officials have suggested that vaccine could take around 12 to 18 months.

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Coronavirus and Vaccine

Scientists at the University of Oxford have made a vaccine, and tested it on monkeys last year. It works well. Scientists hope to get approved by regulators. Then they can conduct the clinical trial. However, scientists are not sure humans have the same immunity as monkeys. Health officials have suggested that the vaccine could take around 12 to 18 months.
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Coronavirus and Vaccine

Scientists at the University of Oxford, have made a vaccine and tested it on a monkey/monkeys in the last two months, it works well on monkeys. Scientists hope to get it approved by regulators, then they can conduct the clinical trial. However, scientists are not sure whether humans have the same immunity as monkeys. Health officials have suggested that vaccine could take around 12 to 18 months to mass produce.

Presumably you are referring to Covid-19 that research could only have started this year in the last two months approximately. "Last year implies in last twelve months"
"to get it approved by regulators" or "to get/receive approval from regulators" you can phrase it in any of these two ways.

"on a monkey" or "on monkeys" is the usual practice and which vaccine? you need to state which vaccine for which disease to avoid confusion between any other vaccine and the current Covid-19 crisis.

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