Complex sentence: The use of these trains on the Thameslink Route is an interim measure due to the late delivery of the Thameslink Programme, upon the introduction of the new Class 700 Desiro City trains they will be cascaded to other routes.
Split into simpler sentences: The use of these trains on the Thameslink Route is an interim measure due to the late delivery of the Thameslink Programme. Upon the introduction of the new Class 700 Desiro City trains they will be cascaded to other routes.