Complex sentence: This issue is not a new progression in Derek Kellogg's career at UMass, last year Derek Kellogg was rated among the least stable job security in the Atlantic 10 by ESPN.
Split into simpler sentences: This issue is not a new progression in Derek Kellogg's career at UMass. Last year Kellogg's job stability was rated as being among the least stable in the Atlantic 10 by ESPN.