Complex sentence: Phase 1 opened on June 30,2012 from Oido Station to Songdo station, though an in-fill station called Darwol Station opened in late 2014 as the surrounding area, Baegot New Town, became more developed.
Split into simpler sentences: Phase 1 opened on June 30,2012 from Oido Station to Songdo station. An in-fill station called Darwol Station opened in late 2014 as the surrounding area, Baegot New Town, becomes more developed.