Unmerging excel rows, and duplicate data

I have been given a fairly large database stored in Microsoft Excel, which I have to try convert into something useful.
However, one of the problems that I am encountering is that some of the data is merged together (horizontally in 2s).

For example;

row 1: [ x ][ x ][ x ][ x ][ x ]
row 2: [ x ][ x ][ o    o ][ x ]
row 3: [ o    o ][ x ][ o    o ]

Where x's are single cells and o's are merged together

What I want to do is unmerge all the rows (which I could do fairly easy with the unmerge button), but for where the merged cell was, have the data duplicated across the 2 cells.
From; [[ Some Data ]]
To; [ Some Data ][ Some Data ]

Thanks! Any help is appreciated.