There are a few answers here. I imagine that Excel has converted your date/time into its date serial format in the background, and that you can change the number format of the column to how you like. However, if it is truly text, you can use the Text to Columns function under Data>Data Tools; set your delimiter to "space." If for some reason neither of those options work, and again, it is definitely text, you can use the following formulas to get everything to the left of the space and the right of the space:

=LEFT(C2,FIND(" ",C2)-1)
=RIGHT(C2,LEN(C2)-FIND(" ",C2))

Have a great evening!