Conversation so far:
What businesses does Cal Ripken Jr own?
Carl Ripken Jr owns several minor league baseball teams
What minor league baseball team does Carl Ripken Jr own?
the Aberdeen IronBirds
When did Carl Ripken Jr purchase the Aberdeen Ironbirds team?
In 2002
Was the Aberdeen Ironbirds of minor lesgue baseball owned by Carl Ripken Jr successful?
What team did Carl Ripken Jr. buy after the Aberdeen Ironbirds?
the Augusta GreenJackets of the South Atlantic League

Question: When did he buy this team?
Self-contained rewrite: When did Carl Ripken Jr.  buy the Augusta Greenjackets of the south atlantic league team?