[To be sure] sin was in the world before ever the Law was given, but sin is not charged to men's account where there is no law [to transgress].
(for until the law sin was in the world: but sin is not imputed when there is no law.
for until the law sin was in the world; but sin is not imputed when there is no law.
Although sin was in the world, since there was no Law, it wasn’t taken into account until the Law came.
For even before the law, sin was in the world, but sin was not imputed while the law did not exist.