Complex sentence: Ryan D. Martin (born Feb 26,1993) is an American lightweight professional boxer who, as an amateur, was an Olympic hopeful and won several National Amateur Championships but failed to qualify for the 2012 Olympics.
Split into simpler sentences: Ryan D. Martin (born Feb 26,1993) is an American lightweight professional boxer. As an amateur, he was an Olympic hopeful and won several National Amateur Championships but failed to qualify for the 2012 Olympics.