Complex sentence: After some days of poor weather "Halibut" entered the approaches to the Tsugaru Strait, firing on a freighter found by radar in foggy conditions she expended six more torpedoes for no results.
Split into simpler sentences: After some days of poor weather, "Halibut" entered the approaches to the Tsugaru Strait. Firing on a freighter found by radar in foggy conditions, she expended six torpedoes for no results.