Complex sentence: After the war and until his death, he wrote "letters to the editor" to the Atlanta Constitution as Bill Arp which were typically in "Cracker dialect" talking about all manner of things that he couldn't say as a public figure.
Split into simpler sentences: After the war and until his death, he wrote "letters to the editor" to the Atlanta Constitution as Bill Arp. They were typically in "Cracker dialect" talking about all manner of things that he couldn't say as a public figure.