QUESTION: Fix punctuation: You will have the functionality you need and the great style that you want by using a leather tote bag
ANS: You will have the functionality you need, and the great style that you want, by using a leather tote bag.

QUESTION: Fix punctuation: Number of passengers 918 1200
ANS: Number of passengers 918 / 1.200

QUESTION: Fix punctuation: The main population and industrial areas are in south Wales consisting of the coastal cities of Cardiff the capital political and economic centre Swansea and Newport and the South Wales Valleys to their north
ANS: The main population and industrial areas are in south Wales, consisting of the coastal cities of Cardiff (the capital, political and economic centre), Swansea and Newport and the South Wales Valleys to their north.

QUESTION: Fix punctuation: Dear friends and prospective customers
ANS:
Dear friends and prospective customers,