Get twice as much for half the effort is a common permutation. I understand your two sentences, but they are not as colloquial.
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nikoer30127"to yield twice the result with half the effort"There is no reason to change it. Both of them mean the same thing and both are correct (as shown).
... "to double the result with half the effort"
nikoer30127how do I use it to make sentences?Surely you know how to make a sentence, don't you? You've been writing sentences in order to post your question.