QUESTION: Fix punctuation: Thallium and bismuth are more widely separated in this relation however than lead and thallium Jr bismuth and gold mercury and platinum
ANS: Thallium and bismuth are more widely separated in this relation, however, than lead and thallium, Jr bismuth and gold, mercury and platinum.

QUESTION: Fix punctuation: Potatoes thinly sliced cooked in fat or oil whether or not salted or flavoured in airtight packings suitable for direct consumption not frozen
ANS: Potatoes, thinly sliced, cooked in fat or oil, whether or not salted or flavoured, in airtight packings, suitable for direct consumption, not frozen

QUESTION: Fix punctuation: You will see that the top is lined by the customary Titlebar Menubar and the Toolbar
ANS: You will see that the top is lined by the customary Titlebar, Menubar and the Toolbar.

QUESTION: Fix punctuation: As a stranger in a foreign country the outcome of the court is often decided in advance if the difference in culture and economy can prevent that the accused from presenting his or her defense Future career
ANS:
As a stranger in a foreign country the outcome of the court is often decided in advance if the difference in culture and economy can prevent that the accused from presenting his or her defense. Future career