Complex sentence: Other features of the machinery space were five liquid storage tanks: two large fuel oil tanks on the centre of each wing, with two day service fuel oil tanks just forward of the former, which supplied fuel to all engines by gravity feed.
Split into simpler sentences: Other features of the machinery space were five liquid storage tanks. Two large fuel oil tanks on the centre of each wing, with two day service fuel oil tanks just forward of the former, which supplied fuel to all engines by gravity feed.