Alexi Ogando started off pretty well for the Braves as a veteran signee that could potentially be traded at the deadline for a mid-level prospect possibly. The 32 year old vet has struggled a bit in June however as his ERA has climbed from 2.74 to 3.94 and his FIP of 4.38 suggests that he may actually be worse than that.
With the Braves looking to make changes to the bullpen and make it more reliable as well as give some of the younger arms a chance to prove themselves, the Braves made a move.
Whether or not Ogando plays another game for the Braves is somewhat in question given that there other clubs that could be interested in his services.