Complex sentence: In addition to the semaphore cactus, the arrival of "Cactoblastis cactorum" to the United States caused concern for the ornamental cactus industry in Arizona, California, Nevada, New Mexico and Texas.
Split into simpler sentences: In addition to the semaphore cactus, the arrival of "Cactoblastis cactorum" to the United States caused concern for the cactus industry. Cacti are grown for ornamental sale in Arizona, California, Nevada, New Mexico and Texas.