Complex sentence: Since the rotations have different energy barriers, some conformations are more stable than others, an example of where this can easily be see is protein folding, where the protein fold into a stable conformation which is functional while other possible conformations often are not.
Split into simpler sentences: Since the rotations have different energy barriers, some conformations are more stable than others. An example of where this can easily be see is protein folding, where some shapes are stable and functonal, but others are not.