Photoscore gets puzzled with this score because barlines are present outside the staves rather than inside. You'll have to add them inside the staves manually, either on the score or within Photoscore.
PdftoMusic Pro may be an alternative to Photoscore in the case of "vector" pdf files like this one (it doesn't work on "raster" pdf files instead, such as scans). It is able to automatically add the missing barlines. It can output the score in MusicXML format, which can be imported into Sibelius then.
However, as this edition is from CPDL, the fastest path is probably to download the MIDI file from CPDL:
http://www.cpdl.org/wiki/index.php/Magn ... teverdi%29
then import it into Sibelius, and edit it.
Max