Original sentence: However, several of these diplomats spent much of their time in other European capitals—either for personal reasons or because they served multiple embassies (Argentina, Estonian, Latvia, Liberia, Peru, Salvador), were merely sinecures (Belgium), or were unpaid (Honduras)
Edited sentence: However, several of these diplomats spent much of their time in other European capitals—either for personal reasons or because they served multiple embassies (Argentina, Estonian, Latvia, Liberia, Peru, and Salvador), were merely sinecures (Belgium), or were unpaid (Honduras)