The most accurate conversion from PDF to EPUB I have managed to discover after many attempts is by means of the website below on the following order:
1)Open your original PDF file;
2)Convert it to RTF through the website by clicking in "Document Converter" and then "Convert to RTF";
3) After downloading the converted RTF file, go to the website again and click "E-book Converter" and then "Convert to ePub" to convert it from RTF to EPUB.
PS: I only use Calibre to manage my e-book colection! Never converted properly to the PRS-T1 with that software...
CLICK HERE TO CONVERT (NO STUPID TRICKS HERE. TRUST ME!): Online Convert