Complex sentence: His government was criticized for its spending, quickly taking the government from surplus to debt--though it was not entirely their fault as the NDP introduced modern accounting practices and were then caught by the huge liabilities the Socred government had hidden off the books.
Split into simpler sentences: His government was criticized for its spending, quickly taking the government from surplus to debt. The NDP argued that the deficit was not entirely their fault as the NDP introduced modern accounting practices, and were caught by the huge liabilities that the Socred government had hidden off the books.