Original sentence: After years of delays, due mainly to archaeological discoveries in the city centre during construction and in part to the Greek financial crisis, most of the main line is scheduled to open in November 2020; the rest of the main line and the Kalamaria extension will be finished by mid-2021, with one further station opening in 2023.The system will be entirely driverless and remote-controlled
Edited sentence: According to Attiko Metro, the completed metro will be "not only better than the Athens Metro, but the most modern metro in Europe".After years of delays, due mainly to archaeological discoveries in the city centre during construction and in part to the Greek financial crisis, most of the main line is scheduled to open in November 2020; the rest of the main line and the Kalamaria extension will be finished by mid-2021