Original: In certain circumstances, however, some people are not counted when working out the number of occupiers so there may be discounts and exemptions.
Simplified: In some cases, however, some people are not counted when calculating the number of occupiers so there may be discounts and exemptions.
Simplified: In certain circumstances, however, some people are not counted when working out the number of occupiers so there may be people missing from the count.
Simplified: In certain circumstances, however, some people are not counted when working out the number of occupiers so there may be discounts and exemptions.