From my reading of science literature promoting evolution, I think that humans did evolve from apes (heck, now evolutionary biologists say modern humans are apes themselves) - but not from any of the now existing species nonhuman apes. The evolutionary books from the 1970s mention fossils of some extinct species of apes (namely, species which the books say were apes) and in the case of some of those extinct species, the books say that those were some of humans ancestors. I also think that maybe even much further back in time an early nonhuman ancestral species of humans evolved from an monkey (a species of monkey which went extinct many tens of millions of years ago). Some of those books even referred to an extinct species which was said to be an apelike monkey (or maybe a monkey-like ape) and a distant ancestor of humans.
As for skulls which are half nonhuman ape and half human, a number of the skulls of some australopithicines appear to be such to me, since they have some human features and some nonhuman ape features. What would be your description of specific features of a skull which is half nonhuman ape and half human? Do you expect that in such a skull every part of the skull must be looking half nonhuman ape and half human? If so, then you won't find such a skull since human evolution didn't work that way. Instead the various parts of the skull evolved human features at different times. For example, The teeth and some aspects of the jaws (such as a 'U" like dental arch versus a "V" like arch or a rectangular arch) evolved human features before the craniums evolved human size proportions. Mosaic evolution is involved.