I had some really great help yesterday, thanks to all that contributed!
However, I did not have success with the suggestions for this issue, I don't
know how to preform a nested function so macros work better for me can anyone
construct one for this? Thanks!

I'm trying to separate data as follows:

From this:
AAIM Aircraft Autonomous Integrity Monitor
ABAS Aircraft Based Augmenting System.

To this:
AAIM Aircraft Autonomous Integrity Monitor
ABAS Aircraft Based Augmenting System.

All caps to column 1 except the first letter of the sentence.

It won't work on space because I also have as follows:

ACCELERATION EAST Aircraft acceleration in true east direction
ACCELERATION EAST Aircraft acceleration in true east direction

To replace? I have 4958 lines....