Complex sentence: About north of the Strait, on the west side of the Red Sea, was an Italian naval base of Massawa (Rear-Admiral Mario Bonetti), well-placed for attacks by submarines and destroyers on convoys.
Split into simpler sentences: About north of the Strait, on the west side of the Red Sea, was an Italian naval base of Massawa (Rear-Admiral Mario Bonetti). It was well-placed for attacks by submarines and destroyers on convoys.