Complex sentence: Each of the ships is equipped with four spherical tanks giving a total capacity of 125,000 cubic metres (138,500 cubic metres in the case of the most recently delivered "Northwest Swan") and utilise docking facilities at the Karratha gas plant's Withnell Bay terminal.
Split into simpler sentences: Each of the ships is equipped with four spherical tanks giving a total capacity of 125,000 cubic metres (138,500 cubic metres in the case of the most recently delivered "Northwest Swan"). They utilise docking facilities at the Karratha gas plant's Withnell Bay terminal.