Complex sentence: The consequent weight savings were negated by additional hull and machinery weights and the ship displaced only slightly less than'K3' although it could be docked in Rosyth and Portsmouth and pass through both canals, once the Suez Canal had been deepened.
Split into simpler sentences: The consequent weight savings were negated by additional hull and machinery weights and the ship displaced only slightly less than'K3'. However, it had the advantage that it could be docked in Rosyth and Portsmouth and pass through both canals, once the Suez Canal had been deepened.