Complex sentence: Class 341 was intended to be the rolling stock for Crossrail prior to its cancellation in the early 1990s; the specifications for this class were later used in drawing up the rolling stock specifications for the current incarnation of Crossrail.
Split into simpler sentences: Class 341 was intended to be the rolling stock for Crossrail prior to its cancellation in the early 1990s. The specifications for Class 341 have been utilised in drawing up the rolling stock specifications for the current incarnation of Crossrail.