Complex sentence: Altering course to port, Riefkohl--who had leapt to the bridge at the alarm--rang down for increased speed; but, in the deafening din of battle, and with his ship and internal communications disrupted, it is doubtful that the order was received.
Split into simpler sentences: Altering course to port, Riefkohl, who had leapt to the bridge at the alarm, rang down for increased speed. With the ship and internal communications disrupted, it is doubtful that the order was received.