QUESTION: Fix punctuation: Prize is doubled if one or more Shark substitute in a winning combination
ANS: Prize is doubled if one or more Shark substitute in a winning combination.

QUESTION: Fix punctuation: The rules in the policies are binding and may not be violated
ANS: The rules in the policies are binding and may not be violated.

QUESTION: Fix punctuation: Winter is the best time to have the mower maintained professionally oil change air filter and spark plug replacement but also sharpening of blades are then often offered more cheaply by lawn mower dealers or specialist companies
ANS: Winter is the best time to have the mower maintained professionally: oil change, air filter and spark plug replacement but also sharpening of blades are then often offered more cheaply by lawn mower dealers or specialist companies.

QUESTION: Fix punctuation: Finally you can now discover everything you need to know about your SSKD file instantly
ANS:
Finally, you can now discover everything you need to know about your .SSKD file... instantly!