Complex sentence: Unlike other members of the ILB fleet the "D"-class (IB1) does not have a rigid hull, all others with the exception of the Arancia, hovercraft & ALB tenders are rigid inflatable boats.
Split into simpler sentences: Unlike other members of the ILB fleet, the "D"-class (IB1) does not have a rigid hull. All others with the exception of the Arancia, hovercraft & ALB tenders are rigid inflatable boats.