Complex sentence: John Painter (Tennessee, September 20,1888-March 1,2001) was posthumously recognized as the world's oldest man and oldest American veteran, as a result of the USA's SSA supercentenarian study.
Split into simpler sentences: John Painter (Tennessee, September 20,1888-March 1,2001). At his death he was (posthumously) recognized as the world's oldest man and oldest American veteran, as a result of the USA's SSA supercentenarian study.