Complex sentence: In 1943 "Black Swan" for a short time saw action near Iceland to provide escort against the U-Boat threat, after which she served in the Mediterranean, on Malta and Adriatic convoy protection duties.
Split into simpler sentences: In 1943 "Black Swan" for a short time saw action near Iceland to provide escort against the U-Boat threat. After which she served in the Mediterranean, on Malta and Adriatic convoy protection duties.