Complex sentence: This can prove to be quite difficult due to the fact that cloning even the most well know mammal can be difficult, let alone a mammal that researchers know little to nothing about, such as the saola.
Split into simpler sentences: This can prove to be quite difficult due to the fact that cloning even the most well known mammal can be difficult. It would be even more so with a mammal that researchers know little to nothing about, such as the saola.