Complex sentence: Trans World Corporation was the original name of the holding company set up to own Trans World Airlines when the airline sought to diversify into other areas of business, a key investment being "Hilton International Hotels", the non-American interests of the Hilton Hotels chain.
Split into simpler sentences: Trans World Corporation was the original name of the holding company set up to own Trans World Airlines. When the airline sought to diversify into other areas of business, a key investment being "Hilton International Hotels", the non-American interests of the Hilton Hotels chain.