Lakers get:

C Daniel Gafford

Mavericks get:

PG Gabe Vincent

SF Dalton Knecht

2028 FRP Swap W/DAL

2031 LAL FRP

Why the Lakers do this:

They add a center that can be a solid rim protector and shooter.

Why the Mavericks do this:

They get a good return for Gafford and clear their big man logjam.