Complex sentence: Since 1919 labor unions had been categorized as organized crime to Okumura they were the rural counterpart to Honolulu's syndicates and the unionists and pagan priests that supported them were no better than the pimps and gangsters of Honolulu.
Split into simpler sentences: Since 1919 labor unions had been categorized as organized crime. To Okumura, they were the rural counterpart to Honolulu's syndicates and the unionists and pagan priests that supported them were no better than the pimps and gangsters of Honolulu.