Complex sentence: However, since the start of construction, several delays to the schedule have been announced; most recently in July 2012, when TVO announced that the unit would not go into service before 2015, five years after the original estimate.
Split into simpler sentences: However, since the start of construction, several delays to the schedule have been announced. In July 2012 TVO announced that the unit would not go into service before 2015, five years after the original estimate.