Complex sentence: Californian packinghouses typically use a fungicide cocktail containing sodium o-phenylphenate, imazalil and thiabendazole, with imazalil having been introduced to combat emerging thiabendazole-resistant strains.
Split into simpler sentences: Californian packinghouses typically use a fungicide cocktail containing sodium o-phenylphenate, imazalil and thiabendazole. In these areas, use of imazalil was later introduced to combat emerging thiabendazole-resistant strains.