Complex sentence: Just after Koenigsegg passed this test, the requirement was deemed too complicated for compliance by low-volume manufacturers, so it is now unnecessary to meet these regulations if the production volume of a given model is less than 10,000 cars annually.
Split into simpler sentences: Just after Koenigsegg passed this test, the test requirement was deemed too complicated for low-volume manufacturers to cope with. So it is now unnecessary to meet these regulations if the production volume of a given model is less than 10,000 cars annually.