Complex sentence: To support the aircraft an improved radar aircraft was needed, and Grumman won the contract for W2F Hawkeye early warning aircraft, which had a search range of 200 nm (370 km), allowing it to cover an area serviced by several of the fighters.
Split into simpler sentences: To support the fighters an improved radar aircraft was needed, and Grumman won the contract for W2F Hawkeye early warning aircraft. This allowed a single Hawkeye it to cover an area serviced by several of the fighters.