Complex sentence: Yet the comparatively rigid nature of bonds which occur between specific atoms, and in essence, defines what we mean by the molecule itself makes an internal coordinate system (bond length, angle between bonds, and twist angle of the bond) the most logical representation.
Split into simpler sentences: Yet the comparatively rigid nature of bonds which occur between specific atoms, and in essence, defines what we mean by the molecule itself. This makes an internal coordinate system (bond length, angle between bonds, and twist angle of the bond) the most logical representation.