Simplify the following text for a Grade 12 native English-speaking person.
Original: In research and polling following the 1999 referendum , the single greatest concern expressed about the referendum as written seemed to be that it did not create and respect a meaningful separation of powers between a Republican President and Parliament and its legislative authority .
Simplified: In research and polling following the 1999 referendum , people said that an appointed President would not be able to act independently of the Parliament .