Conversation so far:
Where was Sean Kelly born?
Sean Kelly was born at Belleville Maternity Home in Waterford city on 21 May 1956.
Where did Sean Kelly grow up?
For eight years Sean Kelly attended Crehana National School, County Waterford.
When did Sean Kelly begin cycling?
Sean Kelly began cycling after his brother had started riding to school in September 1969.

Question: How did he become a prominent cyclist?
Self-contained rewrite: How did Sean Kelly become a prominent cyclist?