Complex sentence: On 6 August 2012, James won the 400m Olympic gold in a time of 43.94, a national record, earning Grenada its first ever Olympic medal and becoming the first non-US runner to break the 44-second mark.
Split into simpler sentences: On 6 August 2012, James won the 400m Olympic gold in a time of 43.94, a national record, earning Grenada its first Olympic medal. He was the first non-US runner to break the 44-second mark.