In theory, international civil servants at the United Nations are prohibited from continuing to draw salaries from their own governments；in practice, however some governments merely substitute living allowances for their employees' paychecks, assigned by them to the United Nations.
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Afor their employees' paychecks, assigned by them
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Bfor the paychecks of their employees who have been assigned
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Cfor the paychecks of their employees, having been assigned
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Din place of their employees' paychecks, for those of them assigned
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Ein place of the paychecks of their employees to have been assigned by them
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