Complex sentence: The interface between the two monomers of a single dimer of acyl-CoA dehydrogenase contains the FAD binding sites and has extensive bonding interactions, while the interface between the two dimers has few interactions.
Split into simpler sentences: The interface between the two monomers of a single dimer of acyl-CoA dehydrogenase contains the FAD binding sites and has extensive bonding interactions. In contrast, the interface between the two dimers has few interactions.