Complex sentence: Minesweeping Operations were conducted with mattresses padding the wheel house to buffer personnel from detonating mines, and occupation duties included survey visits by ships officers to both Hiroshima and Nagasaki.
Split into simpler sentences: Minesweeping Operations were conducted with mattresses padding the wheel house to buffer personnel from detonating mines. Occupation duties included survey visits by ships officers to both Hiroshima and Nagasaki.