editing a pdf file

Answer 1

you can visit this for more information.
http://www.4yousoft.com/pdf-to-epub-converter-mac.htm
or for windows user visit:
http://www.4yousoft.com/pdf-to-epub-converter.htm

Answer 2

split or merge pdf files, you can download professional software
http://www.mp4kits.com/Converter/PDF/split-pdf-documents-splitter/
http://www.mp4kits.com/Converter/PDF/merge-pdf-files-merger/

Answer 3

Click http://www.onlinedocumentconversion.com/ upload, convert to rtf & then edit in MS Word.

24x7, Paypal, few cents per page (paid sites are better).    
Caution!
Avoid free sites or sites with no after sales support a NO NO.