QUES: The exact reason for sudden death is unknown

correct the punctuation.

CORRECTED: The exact reason for sudden death is unknown.

QUES: As malware is becoming more complex and more advanced antivirus software packages are becoming more elaborate

correct the punctuation.

CORRECTED: As malware is becoming more complex and more advanced, antivirus software packages are becoming more elaborate.

QUES: We want to be the leader in quality and available documentation

correct the punctuation.

CORRECTED:
We want to be the leader in quality and available documentation.