Complex sentence: The injunction proved to be an effective tool against Oxnard's biggest and most dangerous gangs, and it was upheld in the Ventura County Superior Court, and was made permanent law in 2005.
Split into simpler sentences: The injunction proved to be an effective tool against Oxnard's biggest and most dangerous gangs. It survived a court challenge to be upheld in the Ventura County Superior Court; the law was made permanent in 2005.