Conversation so far:
What were their successes?
1988 Vuelta a Espana.
What was Vuelta a Espana?
CANNOTANSWER.
What else did the achieve?
Kelly won his only grand tour, over West German Raimund Dietzen.
How did the grand tour go?
After his Vuelta win Kelly returned to Carrick-on-Suir where a parade was held in his honour.
Is there any other interesting aspects about this article?
on the Spanish mainland, Kelly concentrated on winning sprint time bonuses.

Question: Why did he do this?
Self-contained rewrite: Why did Sean Kelly concentrate on winning sprint time bonuses?