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This is probably a result of converting a scanned book from PDF to EPUB. Unfortunately if OCR (optical character recognition) software is not used then the PDF file simply becomes a series of "pictures" of pages - much like scanning a series of photographs. PDF documents produced from a word processor treat the content as text, so they convert to EPUB quite easily. A lot of old books are scanned as "page images" rather than text, I don't know if there is a solution. You could try searching Google books or the Archive Org. for the original PDF of the book and if you have access to a good OCR program try the conversion to text - but don't expect miracles!
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