RobH_en_tn/rev/02/09.md

I know your sufferings and your poverty

"Sufferings" and "poverty" can be translated as verbs. Alternate translation: "I know how you have suffered and how poor you are" (See: rc://en/ta/man/translate/figs-abstractnouns)

I know the slander of those who say they are Jews

"Slander" can be translated as a verb. Alternate translation: "I know how people have slandered you—those who say they are Jews" or "I know how people have said terrible things about you—those who say they are Jews" (See: rc://en/ta/man/translate/figs-abstractnouns)

but they are not

"but they are not real Jews"

a synagogue of Satan

People who gather to obey or honor Satan are spoken of as if they were a synagogue, a place of worship and teaching for the Jews. (See: rc://en/ta/man/translate/figs-metaphor)