Complex sentence: These are considered controversial views which do not accord with the standard model of the Universe, under which it is generally thought that the universe is undergoing expansion, and that redshifts observed in objects outside the Milky Way are a confirmation of this effect.
Split into simpler sentences: These are considered controversial views which do not accord with contemporary models of the universe. It is generally thought that the universe is undergoing expansion, and that redshift observed in objects outside the Milky Way are a confirmation of this effect.