Complex sentence: The IVSR had reached Sukkur in 1879 and the steam ferry that transported eight wagons at a time across the Indus between Rohri and Sukkur was found to be cumbersome and time-consuming.
Split into simpler sentences: The IVSR had reached Rohri in 1879 and a steam ferry would transport eight wagons at a time across the Indus River between from Rohri to Sukkur. This was found to be cumbersome and time-consuming.