This is how I would record changing name from Smith to Jones
Preferred Name: Tom Wilson Smith Jones
Other Name: Tom Wilson Smith
Other Name: Tom Wilson Jones
Note (a custom fact that I have setup in my file):
DescriptionTom legally changed his surname fr Smith to Jones (surname of wife).
Alternatively, you could use Tom Wilson Jones as preferred and not have a name with both, with the name Tom Wilson Smith as an alernative.
In addition, I always record the name as it is found in ALL documents I find and enter into FTM, so I might have other alternative names, like T. W. Jones, etc.