Complex sentence: In most of its range it is unlike any other creature but where it co-exists with the southern white-breasted hedgehog, the two species are difficult to distinguish in the field, the latter having a white spot on its chest.
Split into simpler sentences: In most of its range it is unlike any other creature. However, where it co-exists with the southern white-breasted hedgehog, the two species are difficult to distinguish in the field, the latter having a white spot on its chest.