QUESTION: Fix punctuation: The apartment has a modern and bright living room with a large and comfortable kitchen fully equipped
ANS: The apartment has a modern and bright living room with a large and comfortable kitchen, fully equipped.

QUESTION: Fix punctuation: This consists as mentioned of the fate of all the individual human beings of the earth together
ANS: This consists, as mentioned, of the fate of all the individual human beings of the earth together.

QUESTION: Fix punctuation: In the case that your XL file doesnt open it is highly likely that you do not have the correct software application installed on your PC to view or edit XL file extensions
ANS: In the case that your XL$ file doesn't open, it is highly likely that you do not have the correct software application installed on your PC to view or edit XL$ file extensions.

QUESTION: Fix punctuation: Within the year Dr Herzl was dead at the age of fortyfour
ANS:
Within the year Dr. Herzl was dead, at the age of forty-four.