Complex sentence: The class includes four boats, which are the: "Vanguard"; "Victorious"; "Vigilant"; and "Vengeance", all built at Barrow-in-Furness by Vickers Shipbuilding and Engineering between 1986 and 1999.
Split into simpler sentences: The class includes four boats: "Vanguard"; "Victorious"; "Vigilant"; and "Vengeance". They were built at Barrow-in-Furness by Vickers Shipbuilding and Engineering between 1986 and 1999.