You will have to re-run the inclusion process on all the devices.
You should remove the sensors from the Almond+ but technically it is not necessary if you have reset the remote devices themselves. As an example, for many lightbulbs it is a simple matter of turning the light on and off several times within a given time interval, e.g. on for 5 secs, off for 5 secs, repeat 4x within 120 seconds.
Once a device is "reset" it could care less about the Almond+.
Given that you are asking about adding devices to a Smart Things Hub, it might be appropriate to ask the questions over on ST support forums.