In case you don't want your information to be split over different rows, you can change the cell formatting: Alignment, Text Control, Wrap text => disable.
If you don't want your text to be written across different columns, you can just put a space in the next cell.
If you want to put more than 32767 characters inside one cell: I don't think this is possible, as mentioned in following URL:
https://support.office.com/en-us/article/excel-specifications-and-limits-1672b34d-7043-467e-8e27-269d656771c3
Total number of characters that a cell can contain 32,767 characters
In that case I'd advise you to write some VBA in order to split your information over different cells.