Complex sentence: On 12 January 2010, at 21:53 UTC, (4:53 pm local time) Haiti was struck by a magnitude-7.0 earthquake, the country's most severe earthquake in over 200 years.
Split into simpler sentences: On 12 January 2010, at 4:53pm local time, Haiti was struck by a magnitude-7.0 earthquake. This was the country's most severe earthquake in over 200 years.