Complex sentence: Gearbox lowered that number of rpm to 100 in the transition to the single four-bladed bronze propeller with diameter 6.3 m. Processes to manage by boilers and turbine were automated.
Split into simpler sentences: Gearbox lowered that number of rpm to 100 in the transition to the propeller. One four-bladed bronze propeller had diameter 6.3 m. Processes to manage by boilers and turbine were automated.