Complex sentence: On 10 January 2016, a B-52 flew near the North/South Korean border flanked by South Korean F-15s and U.S. F-16s in response to the supposed test of a hydrogen bomb by North Korea.
Split into simpler sentences: On 10 January 2016, a B-52 flew near the North/South Korean border flanked by South Korean F-15s and United States F-16s. This was in response to the supposed test of a hydrogen bomb by North Korea.