If you merge cells into one cell, the data from the first cell is retained and all other data in the other cells is lost. To get data from lots of cells into another cell you can concatenate them, using the & or the CONCATENATE function. So to combine the contents of cell A1 and B1, to be shown in C1, you could do this:
=CONCATENATE(A1,B1)
or
=A1&B1
To put a space between the contents of the two cells then you would change it slightly, like these:
=CONCATENATE(A1," ",B1)
=A1&" "&B1
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