ClarisWorks has been discontinued for over a decade now, yet some users still find their old documents and wonder how to convert them to something more recent, like MS Office formats.
The easiest way would be to find a copy of the original program and export your files to some exchange format like RTF, CSV etc., however this may not be actually that easy.
Alternatively, you can still find some programs that can open old ClarisWorks/AppleWorks documents and export (at least partially) the data and save them to some more common format like XLSX from Excel.