Complex sentence: By adjusting the valve timing, engine start and stop occur virtually unnoticeable at minimum compression, and fast heating of the catalytic converter to its light-off temperature is possible, thereby reducing HC emissions considerably.
Split into simpler sentences: By adjusting the valve timing, engine start and stop occur virtually unnoticeably at minimum compression. In addition fast heating of the catalytic converter to its light-off temperature is possible, thereby reducing HC emissions considerably.