Group and order output into a single row
If you're running on MySQL:

SELECT
    c.ID,
    ss.LASTNAME,
    ss.FIRSTNAME,
    ss.STREET,
    ss.CITY,
    ss.STATE,
    ss.ZIP,
    GROUP_CONCAT(c.COMMISSION ORDER BY c.DATE SEPARATOR '\n') AS COMMISSION,
    GROUP_CONCAT(c.DATE ORDER BY c.DATE SEPARATOR '\n') AS DATE
FROM db1.Sales_Staff AS ss
JOIN db1.Commission AS c ON (c.ID=ss.ID)
ORDER BY ss.LASTNAME ASC,ss.FIRSTNAME ASC;