Complex sentence: Arthur R. "Doc" Barker (June 4,1899--January 13,1939) was an American criminal, the son of Ma Barker and a member of the Barker-Karpis gang with Alvin Karpis.
Split into simpler sentences: Arthur R. "Doc" Barker (June 4,1899--January 13,1939) was the son of Ma Barker and a criminal. He was a member of the Barker-Karpis gang with Alvin Karpis.