Complex sentence: Functionally, they reduce the Torch's overall weight and ensure that heat from it's Flame is dissipated without conducting down the handle, while also creating a level of transparency in the torch, where one can see through to the flame and burner mechanism.
Split into simpler sentences: Functionally, they reduce the Torch's overall weight and ensure that heat from it's Flame is dissipated without conducting down the handle. They also create a level of transparency in the torch, where one can see through to the flame and burner mechanism.