Complex sentence: This stratified charge is surrounded mostly by air and residual gases, which keeps the fuel and the flame away from the cylinder walls and decreases combustion temperature for lowest emissions and heat losses, as well as increasing air quantity by reducing its dilation which delivers additional power.
Split into simpler sentences: This stratified charge is surrounded mostly by air and residual gases, which keeps the fuel and the flame away from the cylinder walls. Decreased combustion temperature allows for lowest emissions and heat losses and increases air quantity by reducing dilation, which delivers additional power.