Complex sentence: Throughout the peninsula, 30,000 vacationers were stranded, including 26,000 from other nations, mainly from the United States, Canada, and the UK, although many of the stranded were evacuated to shelters, though one of the shelters collapsed due to overcrowding.
Split into simpler sentences: Throughout the peninsula, 30,000 vacationers were stranded, including 26,000 from other nations, mainly from the United States, Canada, and the United Kingdom. Many of the stranded were evacuated to shelters, though one of the shelters collapsed due to overcrowding.