Here the law is described as a person who could not break the power of sin. Alternate translation: "For the law did not have the power to stop us from sinning, because the power of sin within us was too strong. But God did stop us from sinning" (See: [[rc://en/ta/man/jit/figs-personification]])
In this verse, "condemned" is a metonym for "destroyed," and "flesh" is a metonym for our human nature. Alternate translation: "he destroyed sin in our human nature" or "he broke the power of sin in our lives" (See: [[rc://en/ta/man/jit/figs-metonymy]])