Complex sentence: They reported that a new hull would be required, the superstructure would have to be replaced in its entirety, and If it were to be steam powered again an engine and boiler would have to be sourced.
Split into simpler sentences: They reported that a new hull would be required, the superstructure would have to be replaced in its entirety. And If it were to be steam powered again, an engine and boiler would have to be sourced.