Complex sentence: A number of common failure points have been highlighted in the engines produced prior to the introduction of the M47TU2D20, chief among which is'swirl flap' mechanism employed within the inlet manifold.
Split into simpler sentences: A number of common failure points have been highlighted in the engines produced prior to the introduction of the M47TU2D20. Chief among which is'swirl flap' mechanism employed within the inlet manifold.