Complex sentence: He discusses the idea of incomes policy and what he perceives as the Left's growing hostility to incomes policy in the latter half of the 20th century which he regards as misguided, since in his view, all economic policy inevitably affects income distribution.
Split into simpler sentences: He discusses the idea of incomes policy and what he perceives as the Left's growing hostility to incomes policy in the latter half of the 20th century. He regards as misguided since, in his view, all economic policy inevitably affects income distribution.