Complex sentence: The offspring are not genetic copies of the parent, rather it appears as if the parent has some control over what type of child will be formed; this is carried to the extent that they may be mutated and not closely resemble others of the species.
Split into simpler sentences: The offspring are not genetic copies of the parent; rather it appears as if the parent has some control over what type of child will be formed. This is carried to the extent that they may be mutated and not closely resemble others of the species.