Complex sentence: KDEPrint includes a system to pre-filter any jobs before they are handed over to CUPS, or to handle jobs all on itself (such as converting files to PDF); these filters are described by a pair of Desktop/XML files.
Split into simpler sentences: KDEPrint includes a system to pre-filter any jobs before they are handed over to CUPS, or to handle jobs all on itself, such as converting files to PDF. These filters are described by a pair of Desktop/XML files.