Complex sentence: At 430 feet in length but only 45 feet wide "Imo" was a long and narrow ship and, as she was unloaded, her propeller and rudder were nearly out of the water, making her difficult to steer.
Split into simpler sentences: At 430 feet in length but only 45 feet wide "Imo" was long and narrow. Because she was in ballast (without cargo), her propeller and rudder were nearly out of the water, making her difficult to steer.