Complex sentence: Carrying a 5 litre gasoline tank, it needed a small amount of two-stroke oil mixed with the gasoline to run smoothly.The manufacter recommended 4% oil mixture with the gasoline, but now you may use 2%.
Split into simpler sentences: Carrying a 5 litre gasoline tank, it needed a small amount of two-stroke oil mixed with the gasoline to run smoothly. The manufacturer recommended 4% oil mixture with the gasoline, but now you may use 2%.