Complex sentence: Hard determinism is not taken to refer merely to a determinism on earth, but in all of reality (e.g. involving the effects of light from other galaxies, etc); not just during a certain deterministic period of time, but for all time.
Split into simpler sentences: Hard determinism is not taken to refer merely to a determinism on earth, but in all of reality (e.g. involving the effects of light from other galaxies, etc.). Not just during a certain deterministic period of time, but for all time.