Yes, so easy it doesn't really combine them. Compatibilism gives an explanation that essentially redefines what is meant by "free will". Compatibilism makes compatible a concept of determinism and a specific concept of "free will". Yes, it gives a coherent way of speaking about these two seemingly contradictory things; enabling us to avoid nonsense or self-contradiction. However, the compatibilist notion of "free will" is in fact incompatible with what most people mean (or think they mean) when they say they "have free will".