Zotero's export options are

Zotero RDF
MODS
BibTeX
RIS
Refer/BibIX
Unqualified Dublin Core RDF
Wikipedia Citation Templates

of which Sente appears to be able to import BibTeX, Refer , and RIS. I tried BibTeX, but for some reason Sente couldn't handle the file. The Refer file imports okay, but as with RIS the links to PDF break en route.