A long sword refers to any sword that is long, where as a longsword (marked as a typo) is a style of sword, like a shortsword, a broadsword, etc.
If you wanted to write "They are good long swords." would it be better to write "Sȳri korzi issi"?
No, in the sentence they don't reffer to some specific swords, "Syri korzi issi" (sorry i don't have the long y), means that those are good swords, while "Korzi syri issi" means all swords are good ;-)
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