Punctuation preceding

Hi. I'm doing my chemistry coursework and in order to gain the highest marks I need my punctuation to be correct most of the time.

Should the following sentence be like this:

For example, to help determine shelf life within the pharmaceutical industry, tests are carried out...

or like this:

For example, to help determine shelf life within the pharmaceutical industry tests are carried out... (second semi-colon omitted).

Thank you.