Complex sentence: China is also actively developing more advanced turbofan engines for its next generation fighter aircraft, such as the 16.87 kN thrust WS-11 turbofan engine to power its JL-8/K-8 jet trainer aircraft.
Split into simpler sentences: China is also actively seeking to develop the more advanced turbofan engine for its next generation fighter aircraft. China has developed 16.87 kN thrust WS-11 turbofan engine to power its JL-8/K-8 jet trainer aircraft.