Conversation so far:
What was a goal Lionel Messi broke this year?
on 20 March, Messi became the top goalscorer in Barcelona's history at 24 years old.
who did he play for?
Barcelona.

Question: how many goals did he score to break the record?
Self-contained rewrite: how many goals did  Lionel Messi score to break the top goalscorer record ?