Conversation so far:
When did seabiscuit get into racing?
Seabiscuit was bred and born to be a racehorse. As a two-year-old, Seabiscuit raced 35 times.
Did Seabiscuit win his first races?
Seabiscuit failed to win his first 17 races, usually finishing back in the field.

Question: When did Seabiscuit start winning races?
Self-contained rewrite: When did Seabiscuit start winning races?