Complex sentence: Following the closure of the line as a through-route in 1968, the track between Melton Mowbray and was reused as part of the Old Dalby Test Track, used initially for the Advanced Passenger Train project and, more recently, Class 390 Pendolino units.
Split into simpler sentences: Following the closure of the line as a through-route in 1968, the track between Melton Mowbray and was reused as part of the Old Dalby Test Track. This was used initially for the Advanced Passenger Train project and, more recently, Class 390 Pendolino units.