Complex sentence: The company went on to develop the RTM322 turboshaft, which became the European helicopter engine of choice, powering the AgustaWestland EH101, the NH90 and Westland AH-64.
Split into simpler sentences: The company went on to develop the RTM322 turboshaft. This has become the European helicopter engine of choice, powering the AgustaWestland EH101, the NH90 and Westland AH-64.