Complex sentence: Alice Huffman, the daughter of Cal Huffman, suffered a more severe reaction to the gas than the other residents: her throat became so constricted that she stopped breathing and had to be resuscitated.
Split into simpler sentences: Alice Huffman, the daughter of Cal Huffman, suffered a more severe reaction to the gas than the other residents. Her throat became so constricted that she stopped breathing and had to be resuscitated.