Complex sentence: Bay Springs was the site of one of six Sunbeam plants in Mississippi; when it closed, as a result of Albert J. Dunlap's downsizing of the company, 300 people lost their jobs.
Split into simpler sentences: Bay Springs was the site of one of six Sunbeam plants in Mississippi. When Albert J. Dunlap downsized the company and closed the plant, 300 people lost their jobs.