Original sentence: American philosopher David Alan Johnson attempted to systematically debunks the supposed "is/ought gap" in his work "Truth Without Paradox" in which he presents 3 lines of reasoning and numerous counterexamples challenging the idea of there being an insurmountable deductive gap between normative and factual propositions
Edited sentence: American philosopher David Alan Johnson systematically debunks the supposed "is/ought gap" in his work 'Truth Without Paradox' in which he presents 3 lines of reasoning and numerous counterexamples challenging the idea of there being an insurmountable deductive gap between normative and factual propositions