Complex sentence: While many products made within the European Union carry the country of origin label or marking "Made in EU" or "Made in EC", some disreputable manufacturers in European countries that are not part of the EU may use "Made in Europe".
Split into simpler sentences: While many products made within the European Union carry the country of origin label or marking "Made in EU" or "Made in EC". Some disreputable manufacturers in European countries not part of the EU may use "Made in Europe".