Complex sentence: It was developed by joint venture between Westland Helicopters in the UK and Agusta in Italy in response to national requirements for a modern naval utility helicopter; until 2007, the aircraft had been marketed under the designation EH101.
Split into simpler sentences: It was developed by joint venture between Westland Helicopters in the UK and Agusta in Italy in response to national requirements for a modern naval utility helicopter. Prior to 2007, the aircraft had been marketed under the designation EH101.