Conversation so far:
How did musician Gregg Allman spend his final years?
After the dissolution of the Allman Brothers, Allman kept busy performing music with his solo band.
Was Gregg Allman very sick during his final years?
His health problems remained; he had atrial fibrillation, and though he kept it private, his liver cancer had returned.

Question: How bad was his atrial fibrillation?
Self-contained rewrite: How bad was Gregg Allman's atrial fibrillation?