Who voiced concerns that led to this compromise and what were their concerns?

Okay, Im gonna assume that you meant the " GREAT COMPROMISE".

If you were, HERES YOUR ANSWER!

" The Great Compromise was forged in a heated dispute during the 1787 Constitutional Convention: States with larger populations wanted congressional representation based on population, while smaller states demanded equal representation".

"Their so-called Great Compromise (or Connecticut Compromise in honor of its architects, Connecticut delegates Roger Sherman and Oliver Ellsworth) provided a dual system of congressional representation".

"The Great Compromise settled matters of representation in the federal government. The Three-Fifths Compromise settled matters of representation when it came to the enslaved population of southern states and the importation of enslaved Africans. The Electoral College settled how the president would be elected".

"The 'Great Compromise' basically consisted of proportional representation in the lower house (House of Representatives) and equal representation of the states in the upper house (the Senate). The Senators would be chosen by the state legislatures"

this statement is   true