Complex sentence: Smokebox char was used as fuel and the gas was passed from the gas generator through suitable wet scrubbers to remove tar, to two Tilling-Stevens petrol engines, which came from Whippet tanks and were obtained from the Defence Department.
Split into simpler sentences: Smokebox char was used as fuel and the gas was passed from the gas generator through suitable wet scrubbers to remove tar to two Tilling-Stevens petrol engines. The engines came from Whippet tanks and were obtained from the Defence Department.