Conversation so far:
When did Tom Simpson move to Brittany?
Tom Simpson moved to Brittany in April of 1959.
Why did Tom Simpson move to Brittany?
Tom Simpson's National Service papers were delivered. Although willing to serve before his move to France, he feared the call-up would put his potential career at risk.

Question: What did he do once he moved?
Self-contained rewrite: What did Tom Simpson do once he moved to Brittany?