Complex sentence: The driver's control instructions were transmitted by a Chadburn-type machine telegraph (similar to engine order telegraphs on ships) from the control car to the locomotive, where the order had to be acknowledged and implemented by the automatic firebox controllers immediately.
Split into simpler sentences: The driver's control instructions were transmitted from the control car to the locomotive by a Chadburn-type machine telegraph (similar to engine order telegraphs on ships). The order had to be acknowledged and implemented by the automatic firebox controllers immediately.