Need to Clean up my excel file with many columns of text string without losing data

The attached excel file has line delimiters in several columns of string text. The first row is the headers row, which I've been able to use the text to columns function on the data tab and it breaks them into columns. However, when I try to do the same for the other rows, I lose data. Is there any other way to do this and preferably quicker than one column or cell at a time.