Complex sentence: Early reports also suggested that South Korean Navy units had shot at an unidentified ship heading towards North Korea, however a defense official later said that this target may have been a flock of birds that were misidentified on radar.
Split into simpler sentences: Early reports also suggested that South Korean Navy units shot at an unidentified ship heading towards North Korea. A defense official later said that this target may have been a flock of birds that were misidentified on radar.