Conversation so far:
What legacy did J. R. Jayewardene have?
On the economic front, J. R. Jayewardene's legacy was decisive. Since Jayewardene's reforms, the island has maintained healthy growth despite the civil war.
How was J. R. Jayewardene's legacy decisive on the economic front?
For thirty years after independence, Sri Lanka had struggled with slow growth and high unemployment. Since J. R. Jayewardene's reforms, the island has maintained healthy growth despite the civil war.

Question: What reforms?
Self-contained rewrite: What reforms did J. R. Jayewardene do?