Splitting Contents Of A Cell At A Semicolon

I have two lists of over 10,000 text messages each. Each text is in the first cell of the column, with a few random rows being skipped here and there. Within each cell is a lot of information. The information is divided by semicolons, though. So, it's something like. 123;ContactName;+123456790;Date Time;Message

I have two files like this, one incoming and one outgoing. I need a way to not only split the text into different cells (each piece in a separete column), but splice the two files together. I realize if I could section the text into the parts, I could just sort it, but I figured it's better to tell more than less, for the sake there might be an even simpler way of doing it.