Conversation so far:
What was the reasoning behind the band Rush returning to guitar oriented sound?
Why did Rush go on hiatus?
the band entered a five-year hiatus primarily due to personal tragedies in Peart's life.
Was there a reason behind Rush's  hiatus?
the band entered a five-year hiatus primarily due to personal tragedies in Peart's life.

Question: What happened to Peart?
Self-contained rewrite: What happened to Peart from the band Rush?