Conversation so far:
What did Nolan Ryan do?
Nolan Ryan's post-retirement business interests include ownership of two minor league teams.
What did he do next?
the Corpus Christi Hooks, which play in the Class AA Texas League, and the Round Rock Express, a Class AAA team in the Pacific Coast League.

Question: Who did the teams belong too?
Self-contained rewrite: Who did the teams that Nolan Ryan owned belong to?