Complex sentence: The smallest molecule with such a chemical bond, ethane, exists as an infinite number of conformations with respect to rotation around the C-C bond; two of these are recognised as energy minimum (staggered) and energy maximum (eclipsed) forms.
Split into simpler sentences: The smallest molecule with such a chemical bond, ethane, is found to exist as two conformers, staggered and eclipsed. Two of these are recognised as energy minimum (staggered) and energy maximum (eclipsed) forms.