Complex sentence: There is a specific clause that states that the national chapter takes a certain percentage every year from its affiliate chapters nationwide, but there is no reason stated for that, assumed that it is used for its all Alzheimer's related purposes.
Split into simpler sentences: There is a specific clause that states that the national chapter takes a certain percentage every year from its affiliate chapters nationwide, but there is no reason stated for that. It is just assumed that it is used for its all Alzheimer's related purposes.