Conversation so far:
Where did Bobby Robson play internationally?
Bobby Robson played internationally in the West Indies in 1955 and South Africa in 1956.
Where else did Bobby Robson play after 1956?
Who was Bobby Robson playing for in 1957?
Bobby Robson was playing for the England national team in 1957.

Question: Which team did he play for longest?
Self-contained rewrite: Which team did Bobby Robson play for longest?