The Boston Celtics traded Jrue Holiday and Kristaps Porzingis. Why did they do that? What could be next? Here's an explainer.

The Celtics received guard Anfernee Simons in the Holiday trade and forward Georges Niang in the Porzingis deal, plus a total of three second-round draft picks.

Kristaps Porzingis ended up being the Celtics’ second big trade of the summer as he was dealt to the Hawks as part of a three-team deal. Jrue Holiday was moved to the Trail Blazers a day before, ending what was a short-but-successful tenure for both veterans.