Complex sentence: But, unfortunately, Because there was a difference between the restored width of the Cheonggyecheon and the Bridge's length, the plan can't be fulfilled and the bridge located in Jang-chung Park, as it was, till these days.
Split into simpler sentences: But, unfortunately the plan can't be fulfilled, cause there was a difference between the restored width of the Cheonggyecheon and the Bridge's length. So, the bridge located in Jang-chung Park, as it was, till these days.