Simplify the following text for a Grade 18 native English-speaking person.
Original: Honorary members form another group , to which there is no numerical limit , though such appointments are rare ; individuals from countries in the Commonwealth of Nations that are not headed by Elizabeth II are therefore considered foreigners , and thus are granted only honorary admissions , such as Nelson Mandela ( South Africa ) and Mother Teresa ( India ) .
Simplified: Honorary members form another group , to which there is no limit , though such appointments are rare ; individuals from countries in the Commonwealth of Nations that are not headed by Elizabeth II are considered foreigners , and thus are granted only honorary admissions , such as Nelson Mandela ( South Africa ) and Mother Teresa ( India ) .