Complex sentence: The frequently-traveled 400-kilometre (250 mi) route from Incheon to Jeju usually took 13.5 hours, but on the morning of 16 April the ship began to take on water.
Split into simpler sentences: The frequently-traveled 400-kilometre (250 mi) route from Incheon to Jeju usually took 13.5 hours. On the morning of 16 April the ship began to take on water.