Complex sentence: It does not work when we enter the realm of nonlinearity, because we cannot separate the variables, we cannot define an emergent structure as a linear function of its parts, the whole and the parts are one in the same.
Split into simpler sentences: It does not work when we enter the realm of nonlinearity, because we cannot separate the variables. We cannot define an emergent structure as a linear function of its parts, the whole and the parts are one in the same.