Complex sentence: Shortly thereafter, Kelly married Kathryn Thorne, who purchased Kelly's first machine gun and went to great lengths to familiarize his name in the underground crime circles; she was known to hand out the expended.45cal cartridge casings from his Tommy Gun as souvenirs.
Split into simpler sentences: Shortly thereafter, Kelly married Kathryn Thorne, who purchased Kelly's first machine gun and went to great lengths to familiarize his name in the underground crime circles. She was known to hand out the expended.45cal cartridge casings from his Tommy Gun as souvenirs.