Original sentence: A key problem for opponents of ID is that ID does not explain where the "intelligent designer" comes from.These opponents say that instead of reducing the problem of evolution it has greatly expanded it and made it much more difficult, since now explanations have to cover a newly introduced supernatural entity while evolution does not need to
Edited sentence: Since now explanations have to cover a newly introduced super entity while evolution does not need non- or supra-terrestrial intervention.The key problem of ID is that is does not explain where the intelligent designer comes from, instead of reducing the problem of evolution it has greatly expanded it and made it much more difficult