Complex sentence: Much delayed, the railway was finished after roughly 9 years of construction, to a cost of 4.7 billion euro, far exceeding the original budget of 2.53 billion euro.
Split into simpler sentences: Much delayed, the railway was finished after roughly 9 years of construction. The project management states a cost of 4.7 billion euro, far exceeding the original budget of 2.3 billion euro.