Complex sentence: In the "Katzenbach v. Morgan" case, decided in 1966, the Supreme Court concluded that Congress can forbid practices that are not themselves unconstitutional, if the law is aimed at preventing or remedying constitutional violations.
Split into simpler sentences: In the "Katzenbach v. Morgan" case, decided in 1966, the Supreme Court appeared to take a broader view of the Congressional power of enforcement. In that case, the Court concluded that Congress can forbid practices that are not themselves unconstitutional, if the law is aimed at preventing or remedying constitutional violations.