"Once the defect is found and fixed. A team will have to run through the program and test it. To make sure there are no remaining defects and that the program is running perfectly. "
This doesn't make sense, it would be better if you got rid of the full stops and replaced them with a commas.
For example: "Once the defect is found and fixed, a team will have to run through the program and test it to make sure there are no remaining defects and that the program is running perfectly."
"Once the defect is found and fixed. A team will have to run through the program and test it. To make sure there are no remaining defects and that the program is running perfectly. "
This doesn't make sense, it would be better if you got rid of the full stops and replaced them with a commas. For example: "Once the defect is found and fixed, a team will have to run through the program and test it to make sure there are no remaining defects and that the program is running perfectly."