Simplify the following text for a Grade 11 native English-speaking person.
Original: There have been accusations that the decision-making structure is undemocratic as the US has a veto on some constitutional decisions with just over 16 % of the shares in the bank ; Decisions can only be passed with votes from countries whose shares total more than 85 % of the bank 's shares .
Simplified: The US has just over 16 % of the shares in the bank ; some people say this makes the voting unfair because they have too much power , as decisions only happen if the countries that support it have 85 % of the bank 's shares .