Texts from old documents and presentations made using StarOffice can be exported and saved as separate text files (.txt) in their respective original programs, or in any successor software that still supports these file types.
Convert Apache OpenOffice presentation to Simple text file.
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert sdp to txt on Windows
Older multi-platform office productivity suite
Convert from sdp file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.