Depending on how the book is formatted, you might get decent results by converting the ePub to MOBI with Calibre so that it will rasterize the SVG images. Then convert the MOBI back to ePub.
If the resulting bitmap images still strain your Sony do the conversions again checking the "resize images for PalmOS devices" when doing the ePub>MOBI conversion.
If the original ePub gets too fancy with its text formatting you may find that you need to tweak the final ePub. Most of the time, though, the ePub>MOBI conversion works well without disturbing things.
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