Complex sentence: The duties of the Deputy Prime Minister are to act on behalf of the Prime Minister in his or her absence overseas or on leavehgf banana Deputy Prime Minister has always been a member of the Cabinet, and has always held at least one substantive portfolio.
Split into simpler sentences: The duties of the Deputy Prime Minister are to act on behalf of the Prime Minister in his or her absence overseas or on leave. The Deputy Prime Minister has always been a member of the Cabinet, and has always held at least one substantive portfolio.