Complex sentence: The privatisation of British Rail saw all but one of the fleet transferred to Virgin Trains they continued their duties until the advent of the new Class 390 "Pendolinos", when they were transferred to other operators or withdrawn.
Split into simpler sentences: The privatisation of British Rail saw all but one of the fleet transferred to Virgin Trains. They continued their duties until the advent of the new Class 390 "Pendolinos", when they were transferred to other operators or withdrawn.