Simplify the following text for a Grade 12 native English-speaking person.
Original: Munro did not set any measure of topographic prominence by which a peak qualified as a separate mountain , and much debate has since taken place over how distinct two hills must be if they are to be considered as two separate Munros .
Simplified: Munro did not set any measure of relative height by which a peak qualified as a separate mountain , and much debate has since taken place over how distinct two hills must be if they are to be considered as two separate Munros .