Complex sentence: In a radio interview, he mentioned that the robber who shot him was eventually incarcerated, and in prison some fans of Morris who happened to be inmates there teamed up and beat up the robber in revenge.
Split into simpler sentences: In a radio interview, he mentioned that the robber who shot him, was eventually convicted and incarcerated. In prison, fans of Morris, who happened to be inmates there, teamed up and beat up the robber, in revenge.