Original: The company's two principal divisions are the New York Mercantile Exchange and Commodity Exchange, Inc (COMEX), once separately owned exchanges.
Simplified: The New York Mercantile Exchange (NYMEX) is the world's largest physical commodity futures exchange, located in New York City. Its two principal divisions are the New York Mercantile Exchange and the New York Commodities Exchange (COMEX) which were once independent companies but are now merged.