lower control arm broke
when the ball joint was making noise did you not think you should have it looked at? Or did you hit a really large pothole? OR both?
did it rust out? Some years of Escapes were having a sever issue with rust.
In general if you have to ask how to fix a general part like that, the answer is “take it to a good local mechanic.”
I don’t think an LCA replacement is a good novice project.
How do you fix it? You buy a new one and replace it. Get an alignment afterwards.
Like with any other repair job, one buys a good-quality part, and uses it to replace the broken part.
Hopefully the OP didn’t think that he could weld that LCA back together.
you wrap it in a cast and wait a few months.
… and give it an iron supplement.
You replace the lower control arm with a new part.
Rockauto has your control arm for $46.00 plus shipping.