Add punctuation: Before buying a vacuum cleaner Samsung SC6160 specify all your options equipment appearance and warranty from the seller Please note that we are not engaged in the sale and manufacture warranty
A: Before buying a vacuum cleaner Samsung SC6160 specify all your options, equipment, appearance and warranty from the seller. Please note that we are not engaged in the sale and manufacture warranty.

Add punctuation: Maximum voltage V 230
A: Maximum voltage (V): 230

Add punctuation: Studies have also showed that people who are deprived of sleep for a period of time will develop psychoses
A:
Studies have also showed that people who are deprived of sleep for a period of time will develop psychoses.