这是一篇有关中共反垄断法的文章，想询问一下翻译是否正确？
主文的上一段:
Foreign companies that fall foul of the law are treated more harshly than
their domestic counterparts. When the NDRC alleged that China Mobile and
China Unicom, the country’s main fixed-line carriers, were behaving like
monopolies, the result was a “recommended restructuring” that included no
punitive measures. By contrast, an investigation of western car companies and
their local partners over similar alleged transgressions resulted in big
fines.
前文:
Almost all the fines issued by the NDRC since China’s antitrust law came
into force in 2008 have related to the fixing of retail prices.
自从2008年中国当局实施有关控制零售商品价格的反垄断法以来，
几乎所有罚款都是由中国国家发展和改革委员会(NDRC)所惩处的。
主文：（翻译得有点不到位，想请教如何修改？）
This is not unlawful per se – only when it restricts competition.
只有当厂商（it）限制市场竞争的时候，才会违法。
But the regulator has barely even attempted to prove that this is the case.
但是中国的监管单位通常很少，甚至没有试图去证明这种情况(限制市场竞争)
。不知道有没有理解错误?