What is the fine-grained topic of the following text: As you surely know by now, the Royals today took their first step toward building a new starting rotation by shipping young reliever Jonah Bayliss (RC's #19 prospect) and a player to be named later (PTBNL) to the Pittsburgh Pirates for veteran starter Mark Redman. Only return the topic.
Trade between the Royals and Pittsburgh Pirates involving Jonah Bayliss and Mark Redman