Complex sentence: Construction began on 24 April 1999 and the line officially opened in 2002, taking over the train tracks running through the Eastern Harbour Tunnel from the Kwun Tong Line, running from Po Lam to North Point.
Split into simpler sentences: Construction began on 24 April 1999 and the line officially opened in 2002. It took over the existing Kwun Tong Line tracks running through the Eastern Harbour Tunnel, so that full line stretches from Po Lam to North Point.