Complex sentence: The ongoing operation began September 14,2001, in response to the September 11 terrorist attacks, although it is believed this operation simply earned its name after September 14,2001, and began much earlier.
Split into simpler sentences: The ongoing operation began September 14,2001, in response to the September 11 terrorist attacks. Although it is believed this operation simply earned its name after September 14,2001, and began much earlier.