Complex sentence: Testing is due to be undertaken at Siemens' Wildenrath facility from May 2016, entry into passenger service planned for June 2017, with all 30 planned units to be delivered by the end of 2017.
Split into simpler sentences: Testing is due to be undertaken at Siemens' Wildenrath facility from May 2016. Entry into passenger service was originally planned for June 2017, with all 30 planned units to be delivered by the end of 2017.