Complex sentence: When the Derry section reopens 8 trains per day will operate and after the re-signalling phase in 2015 an hourly service between Belfast and Derry is intended.
Split into simpler sentences: When the Derry section reopens, it is expected that 8 trains per day will operate. After the re-signalling phase in 2015, an hourly service is envisaged between Belfast and Derry is intended.