Original sentence: In his Esquisse d'une morale sans obligation ni sanction, probably his most important work on moral theory, he begins from Fouillée, maintaining that utilitarian and postivist schools, despite admitting the presence of an unknowable in moral theory, wrongly expel individual hypotheses directed towards this unknowable
Edited sentence: In his Esquisse d'une morale sans obligation ni sanction, probably his most important work on moral theory, he begins from Fouillée, maintaining that utilitarian and positivist schools, despite admitting the presence of an unknowable in moral theory, wrongly expel individual hypotheses directed towards this unknowable