Complex sentence: A geneticist from the University of Chicago examined Oliver's chromosomes in 1996 and revealed that Oliver had forty-eight chromosomes rather than forty-seven, disproving an earlier claim that he did not have a normal chromosome count for a chimpanzee.
Split into simpler sentences: A geneticist from the University of Chicago examined Oliver's chromosomes in 1996 and revealed that Oliver had forty-eight chromosomes instead of forty-seven. This disproved the earlier claim that he did not have a normal chromosome count for a chimpanzee.