person A: I was really excited to see that an ex coworker of mine moved back to town as was working with me once again. 
person B: Oh that is nice! Why did they move back?
person A: Yea! They had moved away to take care of a sick relative_comma_ but the relative was doing much better and they missed being here so they came back.
person B: Oh fantastic! I am sure they are happy to be home.